Hi,

I try to extend the method product_id_change from the model account.invoice.line as follow :

from openerp.osv import osv, fields

from openerp import api

import openerp.addons.decimal_precision as dp

class account_invoice_line(osv.osv):

     _inherit = 'account.invoice.line'

         _columns = {

         'price_unit_with_tax':fields.float(string='Prix Unitaire TTC', digits= dp.get_precision('Product Price'), readonly=True,),

}

     @api.multi

     def product_id_change(self, product, uom_id, qty=0, name='', type='out_invoice',

             partner_id=False, fposition_id=False, price_unit=False, currency_id=False,

             company_id=None):

         res = super(account_invoice_line, self).product_id_change(product, uom_id, qty=qty, name=name, type=type,

         partner_id=partner_id, fposition_id=fposition_id, price_unit=price_unit, currency_id=currency_id,company_id=company_id)

         if res == 0:

              return res

         context = self._context

        ...

        return res

But when I change the product on an invoice line, I get an error saying that I provide too much arguments :

TypeError: product_id_change() takes at most 11 arguments (15 given)

But the definition of my method product_id_change respect the same number of argument !

I can't get what's wrong in my code!

Thank you for your help

Cheers