diff --git a/pos_remove_pos_category/__openerp__.py b/pos_remove_pos_category/__openerp__.py
index 3c1592e6..faad5315 100644
--- a/pos_remove_pos_category/__openerp__.py
+++ b/pos_remove_pos_category/__openerp__.py
@@ -1,23 +1,7 @@
 # -*- coding: utf-8 -*-
-##############################################################################
-#
-#    OpenERP, Open Source Management Solution
-#    Copyright (C) 2015-TODAY Akretion (<http://www.akretion.com>).
-#
-#    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/>.
-#
-##############################################################################
+# © 2016 Akretion (<http://www.akretion.com>).
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+# -*- encoding: utf-8 -*-
 
 {
     'name': 'POS Remove POS Category',
diff --git a/pos_remove_pos_category/product.py b/pos_remove_pos_category/product.py
index d4fcf4bc..1396912a 100644
--- a/pos_remove_pos_category/product.py
+++ b/pos_remove_pos_category/product.py
@@ -46,8 +46,8 @@ class ProductCategory(models.Model):
 
     image = fields.Binary(help='Show Image Category in Form View')
     image_medium = fields.Binary(help='Show image category button in POS',
-                                 compute="_get_image",
-                                 inverse="_set_image",
+                                 compute="_compute_get_image",
+                                 inverse="_inverse_set_image",
                                  store=True)
     available_in_pos = fields.Boolean(
         string="Available in the Point of Sale",
@@ -57,13 +57,14 @@ class ProductCategory(models.Model):
              "whatever their checkbox state.")
 
     @api.multi
-    def _get_image(self):
+    def _compute_get_image(self):
         return dict(
             (rec.id, tools.image_get_resized_images(rec.image)) for rec in
             self)
 
-    @api.one
-    def _set_image(self):
+    @api.multi
+    def _inverse_set_image(self):
+        self.ensure_one()
         return self.write(
             {'image': tools.image_resize_image_big(self.image_medium)})