diff --git a/product/ERP5Legacy/tests/testLegacySimulationPackingList.py b/product/ERP5Legacy/tests/testLegacySimulationPackingList.py
index c2f70e0a168d2198565c3aa453a4fa6f3e02cfcd..7d5ca85230418f90177e985b10829b273b6c836c 100644
--- a/product/ERP5Legacy/tests/testLegacySimulationPackingList.py
+++ b/product/ERP5Legacy/tests/testLegacySimulationPackingList.py
@@ -589,7 +589,7 @@ class TestPackingListMixin(TestOrderMixin):
     resource_list = sequence.get('resource_list')
     for simulation_movement in simulation_movement_list:
       simulation_movement.recordProperty('start_date')
-      simulation_movement.edit(stop_date=self.datetime+15)
+      simulation_movement.edit(start_date=self.datetime+15)
       simulation_movement.expand()
 
   def stepModifyOneSimulationLineStartDate(self,sequence=None, sequence_list=None, **kw):