diff --git a/stock_available_to_promise_release/models/stock_move.py b/stock_available_to_promise_release/models/stock_move.py
index 65fe8953f2..d91232268d 100644
--- a/stock_available_to_promise_release/models/stock_move.py
+++ b/stock_available_to_promise_release/models/stock_move.py
@@ -579,6 +579,8 @@ def _split_origins(self, origins):
         """
         self.ensure_one()
         qty = self.product_qty
+        # Unreserve goods before the split
+        origins._do_unreserve()
         rounding = self.product_uom.rounding
         new_origin_moves = self.env["stock.move"]
         while float_compare(qty, 0, precision_rounding=rounding) > 0 and origins:
@@ -591,6 +593,9 @@ def _split_origins(self, origins):
                 new_origin_moves |= self.create(new_move_vals)
                 break
             origins -= origin
+        # And then do the reservation again
+        origins._action_assign()
+        new_origin_moves._action_assign()
         return new_origin_moves
 
     def _search_picking_for_assignation_domain(self):
diff --git a/stock_available_to_promise_release/tests/__init__.py b/stock_available_to_promise_release/tests/__init__.py
index b29b6d9eb4..1eee41662b 100644
--- a/stock_available_to_promise_release/tests/__init__.py
+++ b/stock_available_to_promise_release/tests/__init__.py
@@ -2,3 +2,4 @@
 from . import test_unrelease
 from . import test_unrelease_2steps
 from . import test_unrelease_3steps
+from . import test_unrelease_merged_moves
diff --git a/stock_available_to_promise_release/tests/test_unrelease_merged_moves.py b/stock_available_to_promise_release/tests/test_unrelease_merged_moves.py
new file mode 100644
index 0000000000..199363835d
--- /dev/null
+++ b/stock_available_to_promise_release/tests/test_unrelease_merged_moves.py
@@ -0,0 +1,54 @@
+# Copyright 2023 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
+
+from datetime import datetime
+
+from .common import PromiseReleaseCommonCase
+
+
+class TestAvailableToPromiseRelease(PromiseReleaseCommonCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        delivery_pick_rule = cls.wh.delivery_route_id.rule_ids.filtered(
+            lambda r: r.location_src_id == cls.loc_stock
+        )
+        delivery_pick_rule.group_propagation_option = "fixed"
+        cls.pc1 = cls._create_picking_chain(
+            cls.wh, [(cls.product1, 2)], date=datetime(2019, 9, 2, 16, 0)
+        )
+        cls.shipping1 = cls._out_picking(cls.pc1)
+        cls.pc2 = cls._create_picking_chain(
+            cls.wh, [(cls.product1, 3)], date=datetime(2019, 9, 2, 16, 0)
+        )
+        cls.shipping2 = cls._out_picking(cls.pc2)
+        cls._update_qty_in_location(cls.loc_bin1, cls.product1, 15.0)
+        cls.wh.delivery_route_id.write(
+            {
+                "available_to_promise_defer_pull": True,
+            }
+        )
+        shippings = cls.shipping1 | cls.shipping2
+        shippings.release_available_to_promise()
+        cls.picking1 = cls._prev_picking(cls.shipping1)
+        cls.picking1.action_assign()
+        cls.picking2 = cls._prev_picking(cls.shipping2)
+        cls.picking2.action_assign()
+
+    @classmethod
+    def _out_picking(cls, pickings):
+        return pickings.filtered(lambda r: r.picking_type_code == "outgoing")
+
+    @classmethod
+    def _prev_picking(cls, picking):
+        return picking.move_lines.move_orig_ids.picking_id
+
+    def test_unrelease_merged_move(self):
+        self.assertEqual(self.picking1, self.picking2)
+        moves = self.picking1.move_lines.filtered(lambda m: m.state == "assigned")
+        self.assertEqual(sum(moves.mapped("product_uom_qty")), 5.0)
+        self.shipping2.unrelease()
+        move = self.picking1.move_lines.filtered(lambda m: m.state == "assigned")
+        line = move.move_line_ids
+        self.assertEqual(move.product_uom_qty, 2.0)
+        self.assertEqual(line.product_uom_qty, 2.0)