diff --git a/product/ERP5/PropertySheet/PaymentCondition.py b/product/ERP5/PropertySheet/PaymentCondition.py
index 69d1552ee64becfd9f66932fd8710c40ad44fdf2..eecbd3d1aaf588dcac5da5139eb92176fb5aff4a 100755
--- a/product/ERP5/PropertySheet/PaymentCondition.py
+++ b/product/ERP5/PropertySheet/PaymentCondition.py
@@ -45,6 +45,10 @@ class PaymentCondition:
             'description' : 'payment term in a number of days',
             'type'        : 'int',
             'mode'        : 'w' },
+        {   'id'          : 'payment_date',
+            'description' : 'An absolute payment date',
+            'type'        : 'date',
+            'mode'        : 'w' },
         {   'id'          : 'payment_end_of_month',
             'description' : 'is the payment required on the end of month',
             'type'        : 'boolean',