[FIX] rma: same procurement group for reception and delivery

The procurement group created for reception was not being correctly assigned to the RMA,
resulting in a different group being generated for the delivery.

This fix ensures that the same procurement group is used for both operations.

rma/models/rma.py

@@ -712,6 +712,7 @@ def _prepare_reception_procurements(self):
             group = rma.procurement_group_id
             if not group:
                 group = group_model.create(rma._prepare_procurement_group_vals())
+                rma.procurement_group_id = group
             procurements.append(
                 group_model.Procurement(
                     rma.product_id,

rma/tests/test_rma.py

@@ -848,3 +848,18 @@ def test_autoconfirm_email(self):
         )
         self.assertTrue(rma.name in mail_receipt.subject)
         self.assertTrue("products received" in mail_receipt.subject)
+
+    def test_same_procurement_group_for_reception_and_delivery(self):
+        rma = self._create_confirm_receive(self.partner, self.product, 10, self.rma_loc)
+        self.assertTrue(rma.procurement_group_id)
+        delivery_form = Form(
+            self.env["rma.delivery.wizard"].with_context(
+                active_ids=rma.ids,
+                rma_delivery_type="return",
+            )
+        )
+        delivery_form.product_uom_qty = 2
+        delivery_wizard = delivery_form.save()
+        delivery_wizard.action_deliver()
+        self.assertEqual(rma.delivery_move_ids.group_id, rma.procurement_group_id)
+        self.assertEqual(rma.delivery_move_ids.group_id, rma.reception_move_id.group_id)