diff --git a/account_cancel_invoice_check_payment_order/__init__.py b/account_cancel_invoice_check_payment_order/__init__.py
new file mode 100644
index 000000000..2aa5549b3
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/__init__.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+# Copyright (c) 2012 Camptocamp (http://www.camptocamp.com) 
+# All Right Reserved
+#
+# Author : Vincent Renaville (Camptocamp)
+#
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+import account_invoice
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+
diff --git a/account_cancel_invoice_check_payment_order/__openerp__.py b/account_cancel_invoice_check_payment_order/__openerp__.py
new file mode 100644
index 000000000..f39dd45d3
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/__openerp__.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+# Copyright (c) 2012 Camptocamp (http://www.camptocamp.com) 
+# All Right Reserved
+#
+# Author : Vincent Renaville (Camptocamp)
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+{
+    "name" : "Cancel invoice, check on payment order",
+    "version" : "1.0",
+    "depends" : ["base", "account","account_payment","account_cancel"],
+    "author" : "CamptoCamp",
+    "description": """Constraint to not be able to cancel on invoice if already import in payment order
+    """,
+    'website': 'http://www.camptocamp.com',
+    'init_xml': [],
+    'update_xml': [
+    ],
+    'demo_xml': [],
+    'installable': True,
+    'active': False,
+}
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
diff --git a/account_cancel_invoice_check_payment_order/account_invoice.py b/account_cancel_invoice_check_payment_order/account_invoice.py
new file mode 100644
index 000000000..b93bb3a03
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/account_invoice.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+# Copyright (c) 2012 Camptocamp (http://www.camptocamp.com) 
+# All Right Reserved
+#
+# Author : Vincent Renaville (Camptocamp)
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from tools.translate import _
+from osv import osv
+from openerp.osv.orm import TransientModel, fields
+
+class account_invoice(TransientModel):
+    _inherit = "account.invoice"
+    
+    def action_cancel(self, cr, uid, ids, *args):
+        ### 
+        invoices = self.read(cr, uid, ids, ['move_id', 'payment_ids'])
+        for invoice in invoices:
+            if invoice['move_id']:
+                ## This invoice have a move line, we search move_line converned by this move
+                cr.execute("""select (select reference from payment_order where id = order_id) as payment_name,
+                                (select date_done from payment_order where id = order_id) as payment_date,
+                                name from payment_line
+                                where move_line_id in (select id from account_move_line where move_id = %s)""",
+                                (invoice['move_id'][0],))
+                payment_orders = cr.dictfetchall()
+                if payment_orders:
+                    raise osv.except_osv(_('Error !'), _('''Invoice already import in payment \
+                                            order (%s) at %s on line %s''' % 
+                                            (payment_orders[0]['payment_name'],
+                                             payment_orders[0]['payment_date'],
+                                             payment_orders[0]['name'],)))
+        return super(account_invoice,self).action_cancel(cr, uid, ids, *args)
+