# Copyright 2017-2020 Akretion France (http://www.akretion.com/)
# @author: Alexis de Lattre <alexis.delattre@akretion.com>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).


from odoo import fields, models


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

    agreement_id = fields.Many2one(
        comodel_name='agreement', string='Agreement', ondelete='restrict',
        track_visibility='onchange', readonly=True, copy=False,
        states={'draft': [('readonly', False)]})