diff --git a/account_cancel_invoice_check_payment_order/account_invoice.py b/account_cancel_invoice_check_payment_order/account_invoice.py
index 118de852e..2634dcb37 100644
--- a/account_cancel_invoice_check_payment_order/account_invoice.py
+++ b/account_cancel_invoice_check_payment_order/account_invoice.py
@@ -22,7 +22,7 @@ from openerp.tools.translate import _
 from openerp.osv import osv, orm
 
 
-class account_invoice(orm.TransientModel):
+class account_invoice(orm.Model):
     _inherit = "account.invoice"
 
     def action_cancel(self, cr, uid, ids, *args):
diff --git a/account_cancel_invoice_check_voucher/account_invoice.py b/account_cancel_invoice_check_voucher/account_invoice.py
index 91112c334..d2929a190 100644
--- a/account_cancel_invoice_check_voucher/account_invoice.py
+++ b/account_cancel_invoice_check_voucher/account_invoice.py
@@ -24,7 +24,7 @@
 from openerp.tools.translate import _
 from openerp.osv import osv, orm
 
-class account_invoice(orm.TransientModel):
+class account_invoice(orm.Model):
     _inherit = "account.invoice"
 
     def action_cancel(self, cr, uid, ids, context=None):