ContactCompanyToOrder::areItemsBound

public function areItemsBound(ItemIdentifier $parent, ItemIdentifier $child): bool
{
	/** @var Order|null $order */
	$order = Order::load($child->getEntityId());
	if (!$order)
	{
		return false;
	}

	/** @var ContactCompanyEntity|null $client */
	$client = $order->getContactCompanyCollection()->getItemByIdentifier($parent);

	return !is_null($client);
}