ShipmentCollection::getBasketItemDistributedQuantity

public function getBasketItemDistributedQuantity(BasketItem $basketItem)
{
	$collection = $this->getNotSystemItems();

	$allQuantity = 0;

	/** @var Shipment $shipment */
	foreach ($collection as $shipment)
	{
		$allQuantity += $shipment->getBasketItemQuantity($basketItem);
	}

	return $allQuantity;
}