diff --git a/lang/activities.pot b/lang/activities.pot
index 410fa4e..e0a718b 100644
--- a/lang/activities.pot
+++ b/lang/activities.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -23,7 +23,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -65,16 +65,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -129,14 +129,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -169,26 +169,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_ar.utf8.po b/lang/activities_ar.utf8.po
index 8cf7597..b0ba9d3 100644
--- a/lang/activities_ar.utf8.po
+++ b/lang/activities_ar.utf8.po
@@ -5,8 +5,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:53+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Arabic <https://hosted.weblate.org/projects/galette/events-"
 "plugin/ar/>\n"
@@ -23,7 +23,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -65,16 +65,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -129,14 +129,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "تاريخ الإنشاء"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -171,26 +171,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr "تاريخ الإنشاء"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "المَبلغ"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_br.utf8.po b/lang/activities_br.utf8.po
index 7eba03d..7635ba0 100644
--- a/lang/activities_br.utf8.po
+++ b/lang/activities_br.utf8.po
@@ -2,8 +2,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:55+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:55+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: none\n"
 "Language: br\n"
@@ -21,7 +21,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -63,16 +63,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -127,14 +127,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -167,26 +167,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_ca.utf8.po b/lang/activities_ca.utf8.po
index 03b8533..ef07b51 100644
--- a/lang/activities_ca.utf8.po
+++ b/lang/activities_ca.utf8.po
@@ -4,8 +4,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:55+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:55+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Catalan <https://hosted.weblate.org/projects/galette/events-"
 "plugin/ca/>\n"
@@ -21,7 +21,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -63,16 +63,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -127,14 +127,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Comentari"
@@ -167,26 +167,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_de_DE.utf8.po b/lang/activities_de_DE.utf8.po
index 01964da..3e00a73 100644
--- a/lang/activities_de_DE.utf8.po
+++ b/lang/activities_de_DE.utf8.po
@@ -9,8 +9,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:56+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:55+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: German <https://hosted.weblate.org/projects/galette/events-"
 "plugin/de/>\n"
@@ -26,7 +26,7 @@ msgid "Activities management"
 msgstr "Aktivitätsverwaltung"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -75,19 +75,19 @@ msgstr "Neue Buchung erfolgreich hinzugefügt."
 msgid "Subscription has been modified."
 msgstr "Aktivität wurde verändert."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 #, fuzzy
 msgid "An error occurred while storing the subscription."
 msgstr "Fehler beim Speichern der Buchung."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 #, fuzzy
 #| msgid "Do not forget to store the booking"
 msgid "Do not forget to store the subscription"
 msgstr "Vergessen Sie nicht die Buchung zu speichern"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, fuzzy, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr "Lösche Buchung für %1$s bei %2$s"
@@ -144,14 +144,14 @@ msgid "Group"
 msgstr "keine Gruppe"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Erstelldatum"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Kommentar"
@@ -193,30 +193,36 @@ msgstr "Hinzufügen der Buchung gescheitert."
 msgid "Subscription updated"
 msgstr "Aktivität aktualisiert"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+#, fuzzy
+#| msgid "Begin date is mandatory"
+msgid "Subscription already exists for this member and activity"
+msgstr "Startdatum ist erforderlich"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 #, fuzzy
 #| msgid "Members as CSV"
 msgid "Member"
 msgstr "Mitglied"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 #, fuzzy
 #| msgid "%1$s paid"
 msgid "Is paid"
 msgstr "%1$s bezahlt"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Betrag"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_en_US.po b/lang/activities_en_US.po
index 0dde078..f7d17e4 100644
--- a/lang/activities_en_US.po
+++ b/lang/activities_en_US.po
@@ -7,8 +7,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:51+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:53+0200\n"
 "Last-Translator: Automatically generated\n"
 "Language-Team: none\n"
 "Language: en_US\n"
@@ -22,7 +22,7 @@ msgid "Activities management"
 msgstr "Activities management"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -64,16 +64,16 @@ msgstr "New subscription has been successfully added."
 msgid "Subscription has been modified."
 msgstr "Subscription has been modified."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr "An error occurred while storing the subscription."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr "Do not forget to store the subscription"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr "Remove subscription for %1$s on %2$s"
@@ -128,14 +128,14 @@ msgid "Group"
 msgstr "Group"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Creation date"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Comment"
@@ -168,26 +168,30 @@ msgstr "Fail to add new subscription."
 msgid "Subscription updated"
 msgstr "Subscription updated"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
+msgstr "Subscription already exists for this member and activity"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 msgid "Member"
 msgstr "Member"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 msgid "Is paid"
 msgstr "Is paid"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Amount"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr "Payment method"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_es.utf8.po b/lang/activities_es.utf8.po
index 772df15..0ddcec4 100644
--- a/lang/activities_es.utf8.po
+++ b/lang/activities_es.utf8.po
@@ -12,8 +12,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:56+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:55+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Spanish <https://hosted.weblate.org/projects/galette/events-"
 "plugin/es/>\n"
@@ -29,7 +29,7 @@ msgid "Activities management"
 msgstr "Gestión de actividades"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -77,20 +77,20 @@ msgstr "La reserva nueva ha sido agregada correctamente."
 msgid "Subscription has been modified."
 msgstr "Ha sido modificada la actividad."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 #, fuzzy
 #| msgid "An error occurred while storing the booking."
 msgid "An error occurred while storing the subscription."
 msgstr "Ha ocurrido un error al almacenar la reserva."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 #, fuzzy
 #| msgid "Do not forget to store the booking"
 msgid "Do not forget to store the subscription"
 msgstr "No olvide almacenar la reserva"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, fuzzy, php-format
 #| msgid "Remove booking for %1$s on %2$s"
 msgid "Remove subscription for %1$s on %2$s"
@@ -146,14 +146,14 @@ msgid "Group"
 msgstr "Grupo"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Fecha de creación"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Comentario"
@@ -196,30 +196,36 @@ msgstr "Error al agrega una reserva nueva."
 msgid "Subscription updated"
 msgstr "Actividad actualizada"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+#, fuzzy
+#| msgid "Begin date is mandatory"
+msgid "Subscription already exists for this member and activity"
+msgstr "Fecha de inicio obligatoria"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 #, fuzzy
 #| msgid "Members as CSV"
 msgid "Member"
 msgstr "Miembros como *.csv"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 #, fuzzy
 #| msgid "%1$s paid"
 msgid "Is paid"
 msgstr "%1$s pagado"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Monto"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_fr_FR.utf8.po b/lang/activities_fr_FR.utf8.po
index a2e3cdd..2402916 100644
--- a/lang/activities_fr_FR.utf8.po
+++ b/lang/activities_fr_FR.utf8.po
@@ -4,8 +4,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Galette Events plugin\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 15:02+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: French <https://hosted.weblate.org/projects/galette/events-"
 "plugin/fr/>\n"
@@ -21,7 +21,7 @@ msgid "Activities management"
 msgstr "Gestion des activités"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -63,16 +63,16 @@ msgstr "La nouvelle souscription a été ajoutée avec succès."
 msgid "Subscription has been modified."
 msgstr "La souscription a été modifiée."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr "Une erreur est survenue à l'enregistrement de la souscription."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr "N'oubliez pas d'enregistrer la souscription"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr "Supprimer la souscription pour %1$s sur %2$s"
@@ -127,14 +127,14 @@ msgid "Group"
 msgstr "Groupe"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Date de création"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Commentaire"
@@ -167,26 +167,30 @@ msgstr "Erreur à l'ajout de la nouvelle souscription."
 msgid "Subscription updated"
 msgstr "Souscription mise à jour"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
+msgstr "Une souscription existe déjà pour cet adhérent et cette activité"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 msgid "Member"
 msgstr "Adhérent"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 msgid "Is paid"
 msgstr "Est payée"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Montant"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr "Méthode de paiement"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_it_IT.utf8.po b/lang/activities_it_IT.utf8.po
index eea1f8f..14eddd5 100644
--- a/lang/activities_it_IT.utf8.po
+++ b/lang/activities_it_IT.utf8.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:56+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:55+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Italian <https://hosted.weblate.org/projects/galette/events-"
 "plugin/it/>\n"
@@ -23,7 +23,7 @@ msgid "Activities management"
 msgstr "Gestione attività"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -71,21 +71,21 @@ msgstr "È stata aggiunta una nuova prenotazione."
 msgid "Subscription has been modified."
 msgstr "L'attività è stata modificata."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 #, fuzzy
 #| msgid "An error occurred while storing the booking."
 msgid "An error occurred while storing the subscription."
 msgstr ""
 "Si è verificato un errore durante la memorizzazione della prenotazione."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 #, fuzzy
 #| msgid "Do not forget to store the booking"
 msgid "Do not forget to store the subscription"
 msgstr "Non dimenticate di memorizzare la prenotazione"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, fuzzy, php-format
 #| msgid "Remove booking for %1$s on %2$s"
 msgid "Remove subscription for %1$s on %2$s"
@@ -141,14 +141,14 @@ msgid "Group"
 msgstr "Gruppo"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Data di creazione"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Commento"
@@ -191,30 +191,36 @@ msgstr "Fallita aggiunta nuova prenotazione."
 msgid "Subscription updated"
 msgstr "Attività aggiornata"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+#, fuzzy
+#| msgid "Begin date is mandatory"
+msgid "Subscription already exists for this member and activity"
+msgstr "La data di inizio è obbligatoria"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 #, fuzzy
 #| msgid "Members as CSV"
 msgid "Member"
 msgstr "Membri come CSV"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 #, fuzzy
 #| msgid "%1$s paid"
 msgid "Is paid"
 msgstr "%1$s pagata"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Importo"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_nb_NO.utf8.po b/lang/activities_nb_NO.utf8.po
index 715e483..0babdb4 100644
--- a/lang/activities_nb_NO.utf8.po
+++ b/lang/activities_nb_NO.utf8.po
@@ -2,8 +2,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:57+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:56+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: none\n"
 "Language: nb_NO\n"
@@ -18,7 +18,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -60,16 +60,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -124,14 +124,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -164,26 +164,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_oc.utf8.po b/lang/activities_oc.utf8.po
index b6e038d..51b5b1e 100644
--- a/lang/activities_oc.utf8.po
+++ b/lang/activities_oc.utf8.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:57+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:56+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Occitan <https://hosted.weblate.org/projects/galette/events-"
 "plugin/oc/>\n"
@@ -23,7 +23,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -65,16 +65,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -129,14 +129,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Data de creacion"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Comentari"
@@ -177,26 +177,32 @@ msgstr ""
 msgid "Subscription updated"
 msgstr "Data de creacion"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+#, fuzzy
+#| msgid "Begin date is mandatory"
+msgid "Subscription already exists for this member and activity"
+msgstr "Lo jorn de començament es demandat"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 msgid "Member"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 msgid "Is paid"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Montant"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_ota.utf8.po b/lang/activities_ota.utf8.po
index 6c9497e..8857369 100644
--- a/lang/activities_ota.utf8.po
+++ b/lang/activities_ota.utf8.po
@@ -2,8 +2,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:57+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:56+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: none\n"
 "Language: ota\n"
@@ -18,7 +18,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -60,16 +60,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -124,14 +124,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -164,26 +164,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_pt.utf8.po b/lang/activities_pt.utf8.po
index bbe9358..f5411b5 100644
--- a/lang/activities_pt.utf8.po
+++ b/lang/activities_pt.utf8.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:54+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: none\n"
 "Language: pt\n"
@@ -22,7 +22,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -64,16 +64,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -128,14 +128,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -168,26 +168,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_ru.utf8.po b/lang/activities_ru.utf8.po
index e4c8950..868ede1 100644
--- a/lang/activities_ru.utf8.po
+++ b/lang/activities_ru.utf8.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:54+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Russian <https://hosted.weblate.org/projects/galette/events-"
 "plugin/ru/>\n"
@@ -24,7 +24,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -66,16 +66,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -130,14 +130,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -170,26 +170,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_si.utf8.po b/lang/activities_si.utf8.po
index fd3900e..0886de6 100644
--- a/lang/activities_si.utf8.po
+++ b/lang/activities_si.utf8.po
@@ -2,8 +2,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:55+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: none\n"
 "Language: si\n"
@@ -18,7 +18,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -60,16 +60,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -124,14 +124,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -164,26 +164,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_tr.utf8.po b/lang/activities_tr.utf8.po
index f734b6d..e2e3257 100644
--- a/lang/activities_tr.utf8.po
+++ b/lang/activities_tr.utf8.po
@@ -3,8 +3,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:55+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Turkish <https://hosted.weblate.org/projects/galette/events-"
 "plugin/tr/>\n"
@@ -20,7 +20,7 @@ msgid "Activities management"
 msgstr ""
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -62,16 +62,16 @@ msgstr ""
 msgid "Subscription has been modified."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 msgid "An error occurred while storing the subscription."
 msgstr ""
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 msgid "Do not forget to store the subscription"
 msgstr ""
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, php-format
 msgid "Remove subscription for %1$s on %2$s"
 msgstr ""
@@ -126,14 +126,14 @@ msgid "Group"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr ""
@@ -166,26 +166,30 @@ msgstr ""
 msgid "Subscription updated"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
-msgid "Member"
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+msgid "Subscription already exists for this member and activity"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:567
-msgid "Is paid"
+msgid "Member"
 msgstr ""
 
 #: ../lib/GaletteActivities/Entity/Subscription.php:571
+msgid "Is paid"
+msgstr ""
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/activities_uk.utf8.po b/lang/activities_uk.utf8.po
index db9ff92..067b0dc 100644
--- a/lang/activities_uk.utf8.po
+++ b/lang/activities_uk.utf8.po
@@ -5,8 +5,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-08-25 14:51+0200\n"
-"PO-Revision-Date: 2024-08-25 14:55+0200\n"
+"POT-Creation-Date: 2024-08-26 07:53+0200\n"
+"PO-Revision-Date: 2024-08-26 07:54+0200\n"
 "Last-Translator: Johan Cwiklinski <johan@x-tnd.be>\n"
 "Language-Team: Ukrainian <https://hosted.weblate.org/projects/galette/events-"
 "plugin/uk/>\n"
@@ -23,7 +23,7 @@ msgid "Activities management"
 msgstr "Управління діяльностями"
 
 #: ../lib/GaletteActivities/Controllers/Crud/ActivitiesController.php:199
-#: ../lib/GaletteActivities/Entity/Subscription.php:559
+#: ../lib/GaletteActivities/Entity/Subscription.php:563
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:124
 #: ../tempcache/subscription.html.twig:109
@@ -71,20 +71,20 @@ msgstr "Нове бронювання успішно додано."
 msgid "Subscription has been modified."
 msgstr "Діяльність змінено."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:378
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:382
 #, fuzzy
 #| msgid "An error occurred while storing the booking."
 msgid "An error occurred while storing the subscription."
 msgstr "Під час зберігання бронювання сталася помилка."
 
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:388
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:391
 #, fuzzy
 #| msgid "Do not forget to store the booking"
 msgid "Do not forget to store the subscription"
 msgstr "Не забудьте зберегти бронювання"
 
 #. TRANS: %1$s is the member name, %2$s the activity name.
-#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:491
+#: ../lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php:494
 #, fuzzy, php-format
 #| msgid "Remove booking for %1$s on %2$s"
 msgid "Remove subscription for %1$s on %2$s"
@@ -140,14 +140,14 @@ msgid "Group"
 msgstr "Група"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:428
-#: ../lib/GaletteActivities/Entity/Subscription.php:579
+#: ../lib/GaletteActivities/Entity/Subscription.php:583
 #: ../tempcache/activities.html.twig:100 ../tempcache/activities.html.twig:181
 #: ../tempcache/subscription.html.twig:71
 msgid "Creation date"
 msgstr "Дата створення"
 
 #: ../lib/GaletteActivities/Entity/Activity.php:432
-#: ../lib/GaletteActivities/Entity/Subscription.php:591
+#: ../lib/GaletteActivities/Entity/Subscription.php:595
 #: ../tempcache/subscription.html.twig:121
 msgid "Comment"
 msgstr "Коментар"
@@ -190,30 +190,36 @@ msgstr "Не вдалося додати нове бронювання."
 msgid "Subscription updated"
 msgstr "Діяльність оновлено"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:563
+#: ../lib/GaletteActivities/Entity/Subscription.php:328
+#, fuzzy
+#| msgid "Begin date is mandatory"
+msgid "Subscription already exists for this member and activity"
+msgstr "Дата початку є обов’язковою"
+
+#: ../lib/GaletteActivities/Entity/Subscription.php:567
 #, fuzzy
 #| msgid "Members as CSV"
 msgid "Member"
 msgstr "Члени як CSV"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:567
+#: ../lib/GaletteActivities/Entity/Subscription.php:571
 #, fuzzy
 #| msgid "%1$s paid"
 msgid "Is paid"
 msgstr "%1$s оплачено"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:571
+#: ../lib/GaletteActivities/Entity/Subscription.php:575
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:448
 #: ../tempcache/subscription.html.twig:138
 msgid "Amount"
 msgstr "Сума"
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:575
+#: ../lib/GaletteActivities/Entity/Subscription.php:579
 msgid "Payment method"
 msgstr ""
 
-#: ../lib/GaletteActivities/Entity/Subscription.php:583
+#: ../lib/GaletteActivities/Entity/Subscription.php:587
 #: ../tempcache/subscriptions.html.twig:102
 #: ../tempcache/subscriptions.html.twig:432
 #: ../tempcache/subscription.html.twig:77
diff --git a/lang/ar.utf8/LC_MESSAGES/activities.mo b/lang/ar.utf8/LC_MESSAGES/activities.mo
index 4c39a02..211bc15 100644
Binary files a/lang/ar.utf8/LC_MESSAGES/activities.mo and b/lang/ar.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lang/br.utf8/LC_MESSAGES/activities.mo b/lang/br.utf8/LC_MESSAGES/activities.mo
index 27f9ad2..81e83d7 100644
Binary files a/lang/br.utf8/LC_MESSAGES/activities.mo and b/lang/br.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lang/ca.utf8/LC_MESSAGES/activities.mo b/lang/ca.utf8/LC_MESSAGES/activities.mo
index 3d4533c..22012bc 100644
Binary files a/lang/ca.utf8/LC_MESSAGES/activities.mo and b/lang/ca.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lang/de_DE.utf8/LC_MESSAGES/activities.mo b/lang/de_DE.utf8/LC_MESSAGES/activities.mo
index 8742022..9107b1d 100644
Binary files a/lang/de_DE.utf8/LC_MESSAGES/activities.mo and b/lang/de_DE.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lang/en_US/LC_MESSAGES/activities.mo b/lang/en_US/LC_MESSAGES/activities.mo
index e9ec6b9..da51c62 100644
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diff --git a/lang/es.utf8/LC_MESSAGES/activities.mo b/lang/es.utf8/LC_MESSAGES/activities.mo
index 172db35..1f2994c 100644
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diff --git a/lang/fr_FR.utf8/LC_MESSAGES/activities.mo b/lang/fr_FR.utf8/LC_MESSAGES/activities.mo
index 00a366c..9f86478 100644
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diff --git a/lang/it_IT.utf8/LC_MESSAGES/activities.mo b/lang/it_IT.utf8/LC_MESSAGES/activities.mo
index f239afb..e294859 100644
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diff --git a/lang/nb_NO.utf8/LC_MESSAGES/activities.mo b/lang/nb_NO.utf8/LC_MESSAGES/activities.mo
index 4189846..809a01d 100644
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diff --git a/lang/oc.utf8/LC_MESSAGES/activities.mo b/lang/oc.utf8/LC_MESSAGES/activities.mo
index 24c093e..1799038 100644
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diff --git a/lang/ota.utf8/LC_MESSAGES/activities.mo b/lang/ota.utf8/LC_MESSAGES/activities.mo
index 98991cb..0b7d0c2 100644
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diff --git a/lang/pt.utf8/LC_MESSAGES/activities.mo b/lang/pt.utf8/LC_MESSAGES/activities.mo
index 1da6f36..9c9ba97 100644
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diff --git a/lang/ru.utf8/LC_MESSAGES/activities.mo b/lang/ru.utf8/LC_MESSAGES/activities.mo
index 27cace4..bc36213 100644
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diff --git a/lang/si.utf8/LC_MESSAGES/activities.mo b/lang/si.utf8/LC_MESSAGES/activities.mo
index 71ae6db..a687927 100644
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diff --git a/lang/tr.utf8/LC_MESSAGES/activities.mo b/lang/tr.utf8/LC_MESSAGES/activities.mo
index fe457a1..d947709 100644
Binary files a/lang/tr.utf8/LC_MESSAGES/activities.mo and b/lang/tr.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lang/uk.utf8/LC_MESSAGES/activities.mo b/lang/uk.utf8/LC_MESSAGES/activities.mo
index 9b8454d..e44838a 100644
Binary files a/lang/uk.utf8/LC_MESSAGES/activities.mo and b/lang/uk.utf8/LC_MESSAGES/activities.mo differ
diff --git a/lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php b/lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php
index f4b69eb..51ec817 100644
--- a/lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php
+++ b/lib/GaletteActivities/Controllers/Crud/SubscriptionsController.php
@@ -375,9 +375,12 @@ public function doEdit(Request $request, Response $response, int $id = null, str
                 }
             } elseif ($store === false) {
                 //something went wrong :'(
-                $error_detected[] = _T("An error occurred while storing the subscription.", "activities");
-            } else {
-                $error_detected[] = $store;
+                $errors = $subscription->getErrors();
+                if (count($errors)) {
+                    $error_detected = array_merge($error_detected, $errors);
+                } else {
+                    $error_detected[] = _T("An error occurred while storing the subscription.", "activities");
+                }
             }
         }
 
diff --git a/lib/GaletteActivities/Entity/Subscription.php b/lib/GaletteActivities/Entity/Subscription.php
index a2095c3..ebad40e 100644
--- a/lib/GaletteActivities/Entity/Subscription.php
+++ b/lib/GaletteActivities/Entity/Subscription.php
@@ -256,15 +256,15 @@ public function store(): bool
         try {
             $this->zdb->connection->beginTransaction();
             $values = array(
-                Activity::PK        => $this->id_activity,
-                Adherent::PK        => $this->id_member,
-                'is_paid'           => ($this->paid ?:
-                                            ($this->zdb->isPostgres() ? 'false' : 0)),
-                'payment_method'    => $this->payment_method,
-                'payment_amount'    => $this->payment_amount,
+                Activity::PK => $this->id_activity,
+                Adherent::PK => $this->id_member,
+                'is_paid' => ($this->paid ?:
+                    ($this->zdb->isPostgres() ? 'false' : 0)),
+                'payment_method' => $this->payment_method,
+                'payment_amount' => $this->payment_amount,
                 'subscription_date' => $this->subscription_date,
-                'end_date'          => $this->end_date,
-                'comment'           => $this->comment
+                'end_date' => $this->end_date,
+                'comment' => $this->comment
             );
 
             if (!isset($this->id) || $this->id == '') {
@@ -323,6 +323,10 @@ public function store(): bool
 
             $this->zdb->connection->commit();
             return true;
+        } catch (\OverflowException $e) {
+            $this->zdb->connection->rollBack();
+            $this->errors[] = _T('Subscription already exists for this member and activity', 'activities');
+            return false;
         } catch (\Exception $e) {
             $this->zdb->connection->rollBack();
             Analog::log(
diff --git a/tests/GaletteActivities/Entity/tests/units/Activity.php b/tests/GaletteActivities/Entity/tests/units/Activity.php
index c12486e..076f567 100644
--- a/tests/GaletteActivities/Entity/tests/units/Activity.php
+++ b/tests/GaletteActivities/Entity/tests/units/Activity.php
@@ -60,8 +60,8 @@ public function testEmpty(): void
         $activity = new \GaletteActivities\Entity\Activity($this->zdb);
 
         $this->assertNull($activity->getId());
-        $this->assertSame('',$activity->getName());
-        $this->assertSame('',$activity->getCreationDate());
+        $this->assertSame('', $activity->getName());
+        $this->assertSame('', $activity->getCreationDate());
         $this->assertNull($activity->getPrice());
         $this->assertSame('', $activity->getComment());
     }
diff --git a/tests/GaletteActivities/Entity/tests/units/Subscription.php b/tests/GaletteActivities/Entity/tests/units/Subscription.php
index f160082..59daf61 100644
--- a/tests/GaletteActivities/Entity/tests/units/Subscription.php
+++ b/tests/GaletteActivities/Entity/tests/units/Subscription.php
@@ -192,7 +192,7 @@ public function testCrud(): void
         $subscription_id = $subscription->getId();
 
         //member is not part of any group
-        $this->assertCount(0,$member_one->getGroups());
+        $this->assertCount(0, $member_one->getGroups());
 
         $this->assertFalse($subscription->isPaid());
         //by default, amount is set to activity price
@@ -247,6 +247,24 @@ public function testCrud(): void
         $member_one->loadGroups();
         $groups = $member_one->getGroups();
         $this->assertCount(1, $groups);
+
+        //no duplicate on subscriptions
+        $subscription = new \GaletteActivities\Entity\Subscription($this->zdb);
+        $data = [
+            'activity' => $gactivity_id,
+            'member' => $member_one->id,
+            'subscription_date' => (new \DateTime())->format('Y-m-d'),
+            'end_date' => (new \DateTime())->modify('+1 year')->format('Y-m-d'),
+            'comment' => 'Comment ' . $this->seed,
+        ];
+        $this->assertTrue($subscription->check($data));
+        $this->assertFalse($subscription->store());
+        $this->assertSame(
+            [
+                'Subscription already exists for this member and activity'
+            ],
+            $subscription->getErrors()
+        );
     }
 
     /**
diff --git a/tests/TestsBootstrap.php b/tests/TestsBootstrap.php
index 6a3cda2..3a7bb74 100644
--- a/tests/TestsBootstrap.php
+++ b/tests/TestsBootstrap.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * Copyright © 2003-2024 The Galette Team
  *