no invoice number for such orders

-- HikaShop version -- : HikaShop Business: 3.4.0
-- Joomla version -- : 3.8.6

Is it possible to block the invoice number to be generated only for such orders? I need base it on a custom field to generate or not the invoice number.

I've modified massaction_order plugin because the trigger onAfterOrderUpdate makes no result. I have copied part of onBeforeOrderUpdate settings:
$o = clone $order;
if(!empty($order->old)){
foreach($order->old as $key => $value) {
if(!isset($o->$key))
$o->$key = $value;
}
}
$orders = array($o);
instead of
$orders = array($order);
and now the massaction return correct value.