class SaleOrder(models.Model):    _inherit = 'sale.order'        state = fields.Selection(selection_add=[        ('so_hold', 'SO Hold')    ])

    def _action_confirm(self):        """Check if the customer's or their parent's due amount exceeds the available blocking limit."""

        unpaid_invoices = self.env['account.move'].search([            ('partner_id.parent_id', '=', self.partner_id.parent_id.id),            ('state', '=', 'posted'),            ('amount_residual', '>', 0),            ('move_type', 'in', ['out_invoice', 'out_refund'])        ])

        total_unpaid = sum(unpaid_invoices.mapped('amount_residual'))        blocking_limit = self.partner_id.parent_id.blocking_stage        available_credit = blocking_limit - total_unpaid

        _logger.info("blocking_limit: %.2f", blocking_limit)        _logger.info("total_unpaid: %.2f", total_unpaid)        _logger.info("available_credit: %.2f", available_credit)

        if self.partner_id.active_limit and self.partner_id.enable_credit_limit:            to_invoice = self._get_sale_invoice_parent()            required_credit = self.amount_total + to_invoice

            _logger.info("required_credit: %.2f", required_credit)

            if required_credit > available_credit and not self.approval_credit_limit:                _logger.warning("Order exceeds available credit: blocking")                self.over_credit_limit_block = True                self.state = 'so_hold'  # Change state to "so hold"                raise UserError(_(                    "The customer %s is in Blocking Stage. The available credit (%.2f) is not enough to cover the total due "                    "(%.2f).") % (self.partner_id.name, available_credit, required_credit))

        return super(SaleOrder, self)._action_confirm()


I want to change the status, if I click the confirm button then a warning appears then the status changes to SO Hold di odoo 15. I've tried but it doesn't work. can anyone help me...