add TradeModelLine to have create_line property

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27737 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PaySheetModelLine.py

@@ -61,6 +61,7 @@ class PaySheetModelLine(TradeModelLine):
                     , PropertySheet.Price
                     , PropertySheet.VariationRange
                     , PropertySheet.MappedValue
+                    , PropertySheet.TradeModelLine
                     , PropertySheet.PaySheetModelLine
                     , PropertySheet.Predicate
                     , PropertySheet.Reference