Add advantage property to support additional amount of money on Pay Sheet (thanks to Mayoro)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3382 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/PaySheet.py

@@ -40,6 +40,10 @@ class PaySheet:
             'description' : '',
             'type'        : 'date',
             'mode'        : 'w' },
+        {   'id'          : 'advantage',
+            'description' : '',
+            'type'        : 'float',
+            'mode'        : 'w' },
     )
 
     _categories = ( 'source', 'destination',