Task PropertySheet was defined twice.

Add TradeCondition PropertySheet, to be able to use PurchaseCondition acquired
accessors.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19100 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PackingList.py

@@ -78,7 +78,7 @@ class PackingList(Delivery):
                       , PropertySheet.Arrow
                       , PropertySheet.Comment
                       , PropertySheet.Movement
-                      , PropertySheet.Task
+                      , PropertySheet.TradeCondition
                       )
 
     security.declareProtected(Permissions.AccessContentsInformation,