res_users.py

# © 2019 Le Filament (<http://www.le-filament.com>)
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import fields, models, api


class ResUsers(models.Model):
    _inherit = "res.users"

    @api.model
    def _get_ur(self):
        return self.env.user.company_id.ur_id

    ur_id = fields.Many2one('union.regionale', related='company_id.ur_id',
                            string='UR', inherited=True, readonly=True)