erp5_trade: keep date from order

bt5/erp5_trade/DocumentTemplateItem/portal_components/document.erp5.DeliverySimulationRule.py

@@ -84,7 +84,10 @@ class DeliveryRuleMovementGenerator(MovementGeneratorMixin):
   def _getUpdatePropertyDict(self, input_movement):
     # Override default mixin implementation
     return {'order': None,
-            'delivery': None,}
+            'delivery': None,
+            'start_date': input_movement.getStartDate(),
+            'stop_date': input_movement.getStopDate()
+           }
 
   def _getInputMovementList(self, movement_list=None, rounding=None):
     return [self._applied_rule.getParentValue(),]