use getExplanationValue() instead of getParentValue() to get the delivery.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34622 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/SimulationMovement.py

@@ -561,7 +561,7 @@ class SimulationMovement(Movement, PropertyRecordableMixin):
             return False # related movement is not delivered yet
 
           business_path_movement_delivery_document = \
-              business_path_movement_delivery.getParentValue()
+              business_path_movement_delivery.getExplanationValue()
           # here we can optimise somehow, as
           # business_path_movement_delivery_document would repeat
           if not successor_related.isCompleted(