old_contents: # -*- coding: utf-8 -*-
  ##############################################################################
  #
  #    Copyright (C) 2015 Agile Business Group sagl
  #    (<http://www.agilebg.com>)
  #
  #    This program is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Affero General Public License as published
  #    by the Free Software Foundation, either version 3 of the License, or
  #    (at your option) any later version.
  #
  #    This program is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Affero General Public License for more details.
  #
  #    You should have received a copy of the GNU Affero General Public License
  #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  #
  ##############################################################################
  
  from openerp import models, api
  
  
  class AccountInvoiceLine(models.Model):
      _inherit = "account.invoice.line"
  
      @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(AccountInvoiceLine, 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 product:
              if self.user_has_groups(
                      'account_invoice_line_description.'
                      'group_use_product_description_per_inv_line',
              ):
                  product = self.env['product.product'].browse(product)
                  if product.description:
                      if 'value' not in res:
                          res['value'] = {}
                      res['value']['name'] = product.description
          return res
  
new_contents: # -*- coding: utf-8 -*-
  ##############################################################################
  #
  #    Copyright (C) 2015 Agile Business Group sagl
  #    (<http://www.agilebg.com>)
  #
  #    This program is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Affero General Public License as published
  #    by the Free Software Foundation, either version 3 of the License, or
  #    (at your option) any later version.
  #
  #    This program is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Affero General Public License for more details.
  #
  #    You should have received a copy of the GNU Affero General Public License
  #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  #
  ##############################################################################
  
  from openerp import models, api
  
  
  class AccountInvoiceLine(models.Model):
      _inherit = "account.invoice.line"
  
      @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(AccountInvoiceLine, 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 product:
              if self.user_has_groups(
                      'account_invoice_line_description.'
                      'group_use_product_description_per_inv_line',
              ):
                  product = self.env['product.product'].browse(product)
                  description = (product.description_sale
                                 if type in ('out_invoice', 'out_refund')
                                 else product.description_purchase)
                  if description:
                      if 'value' not in res:
                          res['value'] = {}
                      res['value']['name'] = description
          return res
  
subject: fix description set on invoice lines; use description_sale or description_purchase depending on the invoice type