Hi Thanhps,

Why are you doing a browse to try and get the ID though? Why don't you simply get it through the link from sale.order.line to sale.order? For example:

@api.onchange('product_id')
def _compute_customer_code(self):
    if self.product_id:
        partner_id = self.order_id.partner_id

You can write an onchange on the field 'partner_id' to update values from there too. For example:

@api.onchange('partner_id')
def change_order_lines(self):
    for line in self.order_line:
        line. write(!'field': 'value'}) ​   ​

Regards,

Yenthe