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ABU K 
class SaleOrderLine(models.Model): 
   _inherit = 'sale.order.line'

@api.multi
    @api.onchange('product_id')
    def product_id_change(self):
        res = super(SaleOrderLine, self).product_id_change()
      
        self.product_code=self.product_id.barcode
        self.product_code_details=self.product_id.product_code
        self.product_brand_line=self.product_id.brand
        self.price_unit=self.order_id.partner_id.cost*self.product_id.list_price#This is not updating
        print('RESSSSSSSSSS',self.price_unit)
        return res
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Palkesh Baraiya
Best Answer

Hello,

You Can Try This, May be It Will Help You.

print 'res'. Find your Field and Update that one. You Need To Update 'res' so Update res Dictionary, than your Problem was Solved. 

res.update({'price_unit': self.order_id.partner_id.cost * self.product_id.list_price})
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