Employees range items has no parent

crm_employees/models/crm_employees_range.py

@@ -7,14 +7,6 @@ from openerp import models, fields
 
 class CrmEmployeesRange(models.Model):
     _name = 'crm.employees_range'
-    _order = "parent_left"
-    _parent_order = "name"
-    _parent_store = True
     _description = "Employees range"
 
     name = fields.Char(required=True, translate=True)
-    parent_id = fields.Many2one(comodel_name='crm.employees_range')
-    children = fields.One2many(comodel_name='crm.employees_range',
-                               inverse_name='parent_id')
-    parent_left = fields.Integer('Parent Left', select=True)
-    parent_right = fields.Integer('Parent Right', select=True)

crm_employees/views/crm_employees_range_view.xml

@@ -15,7 +15,6 @@
             <field name="arch" type="xml">
                 <tree string="Employees ranges" editable="bottom">
                     <field name="name"/>
-                    <field name="parent_id"/>
                 </tree>
             </field>
         </record>