Hi Sakher,

Try Following,

class res_partner(osv.osv):
      _inherit = 'res.partner'
      _order = 'category_id'

you can also arrange suppliers by ascending order or by descending order.

class res_partner(osv.osv):
      _inherit = 'res.partner'
      _order = 'category_id desc'

Hope it work for you.

thanx for reply,,

the problem exactly.. if i made anew category for supplier,, i write a wrong name,,

how i can change the name,, or change the mother of category ? i work in openerp 7