Shipment creation bug

modules/purchase_trade/tests/test_module.py

@@ -5427,6 +5427,17 @@ class PurchaseTradeTestCase(ModuleTestCase):
                 'vessel': None,
             })
 
+    def test_shipment_in_write_ignores_empty_record_groups(self):
+        'shipment write normalization keeps empty internal writes as no-op'
+        ShipmentIn = Pool().get('stock.shipment.in')
+
+        self.assertEqual(
+            ShipmentIn._normalize_transport_write_args((
+                [],
+                {'cost_price': Decimal('12.34')},
+            )),
+            [])
+
     def test_invoice_report_transportation_uses_truck_label(self):
         'invoice_melya Transportation displays By Truck for truck shipments'
         Invoice = Pool().get('account.invoice')