public function isItemInventoried(Mage_Sales_Model_Quote_Item $item)
    {
        // never consider a child product as inventoried, allow the parent deal
        // with inventory and let the child not need to worry about it as the parent
        // will be the item to keep track of qty being ordered.
        // Both checks needed as child items will not have a parent item id prior
        // to being saved and a parent item prior to being added to the parent (e.g.
        // immediately after being loaded from the DB).
        if ($item->getParentItemId() || $item->getParentItem()) {
            return false;
        }
        // when dealing with parent items, if any child of the product is managed
        // stock, consider the entire item as managed stock - allows for the parent
        // config product in the quote to deal with inventory while allowing child
        // products to not care individually
        if ($item->getHasChildren()) {
            foreach ($item->getChildren() as $childItem) {
                $childStock = $childItem->getProduct()->getStockItem();
                if ($this->isManagedStock($childStock)) {
                    // This Parent is inventoried. Child's ROM setting is 'No backorders', and Manage Stock check hasn't been manually overridden
                    return true;
                }
            }
            // if none of the children were managed stock, the parent is not inventoried
            return false;
        }
        return $this->isManagedStock($item->getProduct()->getStockItem());
    }