whatsapp_web_groups/change_vat_in_partner/models/account_payment.py

from odoo import models, api


class AccountPayment(models.Model):
    _inherit = "account.payment"

    @api.model_create_multi
    def create(self, vals_list):
        vals = super().create(vals_list)
        if type(vals_list) == dict and vals_list.get("ref"):
            partner = self.env['account.move'].search([("name", "=", vals_list["ref"])],limit=1)
            if partner:
                vals["partner_id"] = partner.partner_id.id
        elif type(vals_list) == list and vals_list[0].get("ref"):
            partner = self.env['account.move'].search([("name", "=", vals_list[0]["ref"])],limit=1)
            if partner:
                vals[0]["partner_id"] = partner.partner_id.id
        return vals