protected function _salesQuoteItemSetAttributes(Varien_Event_Observer $observer)
    {
        /** @var Mage_Sales_Model_Quote_Item $quoteItem */
        $quoteItem = $observer->getQuoteItem();
        /** @var Mage_Catalog_Model_Product $product */
        $product = $observer->getProduct();

        $quoteItem->setAdyenPreOrder((bool)$product->getAdyenPreOrder()); // set if product is pre order
    }