diff --git a/account_payment_partner/models/payment_order_create.py b/account_payment_partner/models/payment_order_create.py
index ea8b1ccb3..3b9b536a7 100644
--- a/account_payment_partner/models/payment_order_create.py
+++ b/account_payment_partner/models/payment_order_create.py
@@ -23,17 +23,16 @@
 from openerp.osv import orm
 
 
-class payment_order_create(orm.TransientModel):
+class PaymentOrderCreate(orm.TransientModel):
     _inherit = 'payment.order.create'
 
     def extend_payment_order_domain(
             self, cr, uid, payment_order, domain, context=None):
-        super(payment_order_create, self).extend_payment_order_domain(
+        super(PaymentOrderCreate, self).extend_payment_order_domain(
             cr, uid, payment_order, domain, context=context)
         domain += [
             '|', '|',
             ('invoice', '=', False),
             ('invoice.payment_mode_id', '=', False),
-            ('invoice.payment_mode_id', '=', payment_order.mode.id)
-            ]
+            ('invoice.payment_mode_id', '=', payment_order.mode.id)]
         return True