Order/EventListener/OrderListener.php
protected function detachSaleItemRecursively(SaleItemInterface $item)
    {
        $this->stockAssigner->detachSaleItem($item);

        foreach ($item->getChildren() as $child) {
            $this->detachSaleItemRecursively($child);
        }
    }
protected function detachSaleItemRecursively(SaleItemInterface $item)
    {
        $this->stockAssigner->detachSaleItem($item);

        foreach ($item->getChildren() as $child) {
            $this->detachSaleItemRecursively($child);
        }
    }
Detaches the sale item from stock units recursively.

@param SaleItemInterface $item