in many2one area the comings must be admin, not ordinary users

form will appear in the

. py file

 user_id = fields.Many2one('res.users', string='Requester', index=True, track_visibility='onchange', default=lambda self: self.env.user,  domain = [('user_id', '=', self.user_id.id)]) 

 .xml file

<field name="user_id" options="{'no_create_edit': True}"  />