ShipmentImport::getBasketItemQuantity

private function getBasketItemQuantity(Order $order, SaleBasketItem $basketItem)
    {
        $allQuantity = 0;
        /** @var Shipment $shipment */
        foreach ($order->getShipmentCollection() as $shipment)
        {
            if($shipment->isShipped())
            	continue;

            $allQuantity += $shipment->getBasketItemQuantity($basketItem);
        }

        return $allQuantity;
    }