odoo-contact-addons/partner_contact_birthplace/models/res_partner.py

# -*- coding: utf-8 -*-
# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).
from odoo import fields, models


class ResPartner(models.Model):
    _inherit = "res.partner"

    birthplace = fields.Char("Birth place")