diff --git a/product_category_recursive_property/__openerp__.py b/product_category_recursive_property/__openerp__.py
index 29284e9..4e9d537 100644
--- a/product_category_recursive_property/__openerp__.py
+++ b/product_category_recursive_property/__openerp__.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 # Copyright (C) 2013 - Today: GRAP (http://www.grap.coop)
 # @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
@@ -15,7 +15,7 @@
         'stock_account',
     ],
     'demo': [
-        'demo/res_users.xml',
+        'demo/res_groups.xml',
         'demo/product_category.xml',
     ],
 }
diff --git a/product_category_recursive_property/demo/res_users.xml b/product_category_recursive_property/demo/res_groups.xml
similarity index 51%
rename from product_category_recursive_property/demo/res_users.xml
rename to product_category_recursive_property/demo/res_groups.xml
index 016a09e..87a8eea 100644
--- a/product_category_recursive_property/demo/res_users.xml
+++ b/product_category_recursive_property/demo/res_groups.xml
@@ -7,10 +7,12 @@ License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 <openerp><data>
 
-    <record id="base.user_root" model="res.users">
-        <field name="groups_id" eval="[
-            (4, ref('base.group_no_one')),
-            (4, ref('base.group_sale_manager'))]"/>
+    <record id="base.group_no_one" model="res.groups">
+        <field name="users" eval="[(4, ref('base.user_root'))]"/>
+    </record>
+
+    <record id="base.group_sale_manager" model="res.groups">
+        <field name="users" eval="[(4, ref('base.user_root'))]"/>
     </record>
 
 </data></openerp>
diff --git a/product_category_recursive_property/models/__init__.py b/product_category_recursive_property/models/__init__.py
index ab171ea..1d8d301 100644
--- a/product_category_recursive_property/models/__init__.py
+++ b/product_category_recursive_property/models/__init__.py
@@ -1,2 +1,2 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 from . import product_category
diff --git a/product_category_recursive_property/models/product_category.py b/product_category_recursive_property/models/product_category.py
index 5db0a34..9213034 100644
--- a/product_category_recursive_property/models/product_category.py
+++ b/product_category_recursive_property/models/product_category.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 # Copyright (C) 2013 - Today: GRAP (http://www.grap.coop)
 # @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
diff --git a/product_category_recursive_property/tests/__init__.py b/product_category_recursive_property/tests/__init__.py
index a78faa8..17b8206 100644
--- a/product_category_recursive_property/tests/__init__.py
+++ b/product_category_recursive_property/tests/__init__.py
@@ -1,2 +1,2 @@
-# -*- coding: utf-8 -*-
-from . import test_product_category_recursive_property
+# coding: utf-8
+from . import test_module
diff --git a/product_category_recursive_property/tests/test_product_category_recursive_property.py b/product_category_recursive_property/tests/test_module.py
similarity index 95%
rename from product_category_recursive_property/tests/test_product_category_recursive_property.py
rename to product_category_recursive_property/tests/test_module.py
index 81d9e00..734359e 100644
--- a/product_category_recursive_property/tests/test_product_category_recursive_property.py
+++ b/product_category_recursive_property/tests/test_module.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 # Copyright (C) 2017 - Today: GRAP (http://www.grap.coop)
 # @author: Sylvain LE GAL (https://twitter.com/legalsylvain)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
@@ -6,10 +6,10 @@
 from openerp.tests.common import TransactionCase
 
 
-class TestProductCategoryRecursiveProperty(TransactionCase):
+class TestModule(TransactionCase):
 
     def setUp(self):
-        super(TestProductCategoryRecursiveProperty, self).setUp()
+        super(TestModule, self).setUp()
         self.category_obj = self.env['product.category']
         self.property_obj = self.env['ir.property']
         self.mother_category = self.env.ref(