Trade Model Line should copy a use category from itself, otherwise the form is nonsense.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35102 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/TradeModelLine.py

@@ -249,6 +249,7 @@ class TradeModelLine(Predicate, XMLMatrix, Amount):
         'create_line': self.isCreateLine(),
         'trade_phase_list': self.getTradePhaseList(),
         'target_level': self.getTargetLevel(),
+        'use': self.getUse(),
       }
       common_params.update(property_dict)