diff --git a/addons/website_sale/models/__init__.py b/addons/website_sale/models/__init__.py
index 44b65691c96..e3094751363 100644
--- a/addons/website_sale/models/__init__.py
+++ b/addons/website_sale/models/__init__.py
@@ -1,4 +1,5 @@
 import website_styles
+import payment_transaction
 import product
 import product_attributes
 import website_sale
diff --git a/addons/website_sale/models/payment_transaction.py b/addons/website_sale/models/payment_transaction.py
new file mode 100644
index 00000000000..ffe78ab8762
--- /dev/null
+++ b/addons/website_sale/models/payment_transaction.py
@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+from openerp.osv import orm, fields
+
+
+class PaymentTransaction(orm.Model):
+    _inherit = 'payment.transaction'
+
+    _columns = {
+        # link with the sale order
+        'sale_order_id': fields.many2one('sale.order', 'Sale Order'),
+    }
diff --git a/addons/website_sale/models/website.py b/addons/website_sale/models/website.py
index 3193b41a4fd..a659a35ba6e 100644
--- a/addons/website_sale/models/website.py
+++ b/addons/website_sale/models/website.py
@@ -17,12 +17,3 @@ class Website(orm.Model):
         'pricelist_id': fields.function(
             _get_pricelist, type='many2one', obj='product.pricelist')
     }
-
-
-class PaymentTransaction(orm.Model):
-    _inherit = 'payment.transaction'
-
-    _columns = {
-        # link with the sale order
-        'sale_order_id': fields.many2one('sale.order', 'Sale Order'),
-    }