I want to change the sequence in the delivery movements based on the location field. When the location changes or the products are returned, the movement sequence changes and takes the location code and changes it instead of wh 

But the following code shows Erro

class Stockpicking(models.Model): 

   _inherit = 'stock.picking'

 name = fields.Char(        'Reference', default='/',        copy=False, index='trigram', readonly=True, compute='_get_sequence')    

   location_dest_id = fields.Many2one(        'stock.location', "Destination Location",        compute="_compute_location_id", store=True, precompute=True, readonly=False,        check_company=True, required=True,        states={'done': [('readonly', True)]})

  @api.onchange('location_dest_id')   

 def _get_sequence(self):      

  self.name += self.name.location_dest_id