from openerp import models, fields, api class StockInventoryLine(models.Model): _inherit = 'stock.inventory.line' @api.one @api.depends('product_id') def get_product_ean13(self): self.ean13 = self.product_id.ean13 ean13 = fields.Char(string="Codigo de Barras", compute="get_product_ean13")