account_invoice_calendar_event_eiru/account_invoice.py

# -*- coding: utf-8 -*-
# © 2016 Therp BV <http://therp.nl>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
from openerp import fields, models


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

    calendar_event_ids = fields.One2many(
        'calendar.event', 'account_invoice_id', string='Anotaciones')