don't reexpand tax rule if simulation movement is already linked to a delivery

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24746 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/TaxRule.py

@@ -101,6 +101,7 @@ class TaxRule(DeliveryRule):
         else:
           for existing_simulation_movement in \
                 existing_simulation_movement_list:
+            if existing_simulation_movement.getDelivery() is None:
               existing_simulation_movement.edit(**property_dict)
 
     # Pass to base class