Check::isShipmentExists

private function isShipmentExists(): bool
{
	foreach ($this->getEntities() as $entity)
	{
		if ($entity instanceof Shipment)
		{
			return true;
		}
	}

	foreach ($this->getRelatedEntities() as $relatedEntities)
	{
		foreach ($relatedEntities as $entity)
		{
			if ($entity instanceof Shipment)
			{
				return true;
			}
		}
	}

	return false;
}