diff --git a/models/res_partner_id_category.py b/models/res_partner_id_category.py
index e0ecdea89..b1fb9b6d0 100644
--- a/models/res_partner_id_category.py
+++ b/models/res_partner_id_category.py
@@ -20,19 +20,21 @@ class ResPartnerIdCategory(models.Model):
     _name = "res.partner.id_category"
     _order = "name"
 
+    def _default_validation_code(self):
+        return _("\n# Python code. Use failed = True to specify that the id "
+                 "number is not valid.\n"
+                 "# You can use the following variables :\n"
+                 "#  - self: browse_record of the current ID Category "
+                 "browse_record\n"
+                 "#  - id_number: browse_record of ID number to validate")
+
     code = fields.Char(string="Code", size=16, required=True)
     name = fields.Char(string="ID name", required=True, translate=True)
     active = fields.Boolean(string="Active", default=True)
     validation_code = fields.Text(
         'Python validation code',
         help="Python code called to validate an id number.",
-        default="""
-# Python code. Use failed = True to specify that the id number is not valid.
-# You can use the following variables :
-#  - self: browse_record of the current ID Category browse_record
-#  - id_number: browse_record of ID number to validte
-"""
-        )
+        default=_default_validation_code)
 
     @api.multi
     def _validation_eval_context(self, id_number):