basic.php

    /**
     * We set the on hold flag to true when any work ticket is created.
     * We set the on hold flag to false when any work ticket is approved.
     * @return bool
     */
    public function should_be_on_hold()
    {
        /** @var RepairOrder $order */
        $order = $this->__get('product_order');

        if( ! $order){
            // throw exception, trying to place hold a order that doesnt exist    
        }

        if($order->status == Order::STATUS_NEW && $order->type == Order::TYPE_REPAIR){
            return true;    
        }

        if(! $order->has_been_approved()){
            return true;
        }

        if (in_array($order->status, [Order::STATUS_PENDING_APPROVAL, Order::STATUS_REJECTED]            )
        {
            return true;
        }

        return false
    }