whatsapp_web_groups/custom_sat_connection/models/account_move.py

from odoo import api, fields, models

class AccountMove(models.Model):
    _inherit = "account.move"

    cfdi_id = fields.Many2one(comodel_name="account.cfdi", string="CFDI")
    x_uuid = fields.Char(string="CFDI UIID", related="cfdi_id.uuid", store=True)
    x_delivery_number = fields.Char(string="No. Entrega")
    x_invoice_qty = fields.Integer(string="Unidades facturadas")

    #Eliminar relacion con el cfdi si se cancela el movimiento
    def button_cancel(self):
        res = super(AccountMove, self).button_cancel()
        for rec in self:
            if rec.cfdi_id:
                rec.cfdi_id.attachment_id.write({
                    'res_model': 'account.cfdi',
                    'res_id': rec.cfdi_id.id,
                })
                rec.cfdi_id.write({
                    "state": "draft",
                    "move_id": False
                })
                rec.write({
                    'cfdi_id': False,
                    'x_uuid': False
                })
        return res