from odoo import api, fields, models class ResPartner(models.Model): _inherit = 'res.partner' l10n_hu_eu_vat = fields.Char(compute='_compute_l10n_hu_eu_vat') @api.depends('vat') def _compute_l10n_hu_eu_vat(self): for partner in self: if partner.country_code == 'HU' and partner.vat: partner.l10n_hu_eu_vat = partner._convert_hu_local_to_eu_vat(partner.vat) else: partner.l10n_hu_eu_vat = False