BasketItem::getNotPurchasedQuantity

public function getNotPurchasedQuantity() : float
{
	$quantity = parent::getNotPurchasedQuantity();

	/** @var Order $order */
	$order = $this->getCollection()->getOrder();
	if ($order)
	{
		$quantity -= $order->getShipmentCollection()->getBasketItemShippedQuantity($this);
	}

	return $quantity;
}