diff --git a/src/main/java/alfio/manager/AccessService.java b/src/main/java/alfio/manager/AccessService.java
index 7a9447f78..e251bde66 100644
--- a/src/main/java/alfio/manager/AccessService.java
+++ b/src/main/java/alfio/manager/AccessService.java
@@ -584,7 +584,7 @@ public void checkEventAndReservationOwnership(Principal principal, String eventN
         var eventAndOrgId = checkEventOwnership(principal, eventName);
         int countExisting;
         if (partialIds) {
-            countExisting = reservationRepository.countReservationWithShortIdsForEvent(List.copyOf(reservationIds), eventAndOrgId.getId());
+            countExisting = reservationRepository.countReservationWithShortIdsForEvent(reservationIds.stream().map(String::toLowerCase).toList(), eventAndOrgId.getId());
         } else {
             countExisting = reservationRepository.countReservationsWithEventId(reservationIds, eventAndOrgId.getId());
         }
diff --git a/src/main/java/alfio/repository/TicketReservationRepository.java b/src/main/java/alfio/repository/TicketReservationRepository.java
index 82fcf75a7..7f32c0f23 100644
--- a/src/main/java/alfio/repository/TicketReservationRepository.java
+++ b/src/main/java/alfio/repository/TicketReservationRepository.java
@@ -331,7 +331,7 @@ int updateVatStatus(@Bind("reservationId") String reservationId,
 
 
     @Query("""
-        SELECT count(id) from tickets_reservation where id ilike ANY(
+        SELECT count(id) from tickets_reservation where id like ANY(
                     select s || '%' from unnest(:ids::text[]) s(s)
                 ) and event_id_fk = :eventId
         """)