add calculation_script_id property wich is used to set a script for each Model Line

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17742 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/PaySheetModelLine.py

@@ -34,9 +34,17 @@ class PaySheetModelLine:
   """
   _properties = ( 
     { 'id'          : 'editable',
-            'description' : 'If set to 1, self could be edited at the paySheet creation',
+      'description' : 'If set to 1, the Pay Sheet Line values could be edited \
+          at the Pay Sheet calculation step',
       'type'        : 'boolean',
-            'mode'        : 'w' },
+      'mode'        : 'w' 
+    },
+    { 'id'          : 'calculation_script_id',
+      'description' : 'If no script found on Pay Sheet Model Lines, this \
+          script is used to do localised calculs',
+      'type'        : 'string',
+      'mode'        : 'w',
+    },
   )