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..bdc0e6ae9
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/__init__.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Author Vincent Renaville. Copyright 2012 Camptocamp SA
+#
+#    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 . 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..a0a2b6efe
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/__openerp__.py
@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Author Vincent Renaville. Copyright 2012 Camptocamp SA
+#
+#    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" : ["account",
+                 "account_payment",
+                 "account_cancel"
+                ],
+    "author" : "Camptocamp",
+    "description": """
+Prevents to cancel an invoice which has already been imported in a
+payment order.
+    """,
+    'website': 'http://www.camptocamp.com',
+    'data' : [],
+    '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..118de852e
--- /dev/null
+++ b/account_cancel_invoice_check_payment_order/account_invoice.py
@@ -0,0 +1,54 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Author Vincent Renaville. Copyright 2012 Camptocamp SA
+#
+#    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 openerp.tools.translate import _
+from openerp.osv import osv, orm
+
+
+class account_invoice(orm.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
+                # concerned by this move
+                cr.execute("""SELECT po.reference as payment_name,
+                                     po.date_done as payment_date,
+                                     pl.name
+                              FROM payment_line as pl
+                              INNER JOIN payment_order AS po
+                              ON pl.id = order_id
+                              WHERE move_line_id IN (SELECT id
+                                                     FROM account_move_line
+                                                     WHERE move_id = %s)
+                              LIMIT 1""",
+                           (invoice['move_id'][0],))
+                payment_orders = cr.dictfetchone()
+                if payment_orders:
+                    raise osv.except_osv(
+                            _('Error !'),
+                            _("Invoice already imported in the payment "
+                              "order (%s) at %s on line %s" %
+                              (payment_orders['payment_name'],
+                               payment_orders['payment_date'],
+                               payment_orders['name'])))
+        return super(account_invoice,self).action_cancel(cr, uid, ids, *args)