ShipmentCollection::getBasePriceDelivery

public function getBasePriceDelivery()
{
	$collection = $this->getNotSystemItems();

	$sum = 0;
	/** @var Shipment $shipment */
	foreach ($collection as $shipment)
	{
		$sum += $shipment->getField('BASE_PRICE_DELIVERY');
	}

	return $sum;
}