farm/models/account_invoice.py

# -*- coding: utf-8 -*-
# @authors: Alexander Ezquevo <alexander@acysos.com>
# Copyright (C) 2016  Acysos S.L.
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from openerp import models, fields


class AccountInvoiceLine(models.Model):
    _inherit = 'account.invoice.line'

    animal_qty = fields.Integer(string = 'Num of animals')
    farm = fields.Many2one(string='Farm', comodel_name='stock.warehouse')