diff --git a/product/ERP5/PropertySheet/PaySheet.py b/product/ERP5/PropertySheet/PaySheet.py
index 254c3d15d4a3eac5d02614cb13de937689622d1f..553bdf08cb9565e31a75e9a1452d2deb45406814 100755
--- a/product/ERP5/PropertySheet/PaySheet.py
+++ b/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',