Hello,

I have onchange method who works perfectky from 'title' field.

But, with 'carrier_id' field, my on_change method is not trigerred.... why ? Here is my code : 

From 'title' field, it's OK : 

class sale_order(models.Model):
    _inherit = 'sale.order'

    @api.onchange('title')
    def _onchange_delivery_set_title(self):
        self.incoterm = 1
        self.title = 'change_ok'

From 'carrier_id', not trigered :

class sale_order(models.Model):
    _inherit = 'sale.order'

    @api.onchange('carrier_id')
    def _onchange_delivery_set_carrier(self):
        self.title='not_changed'
        self.incoterm = 2

Thank you for your help !