I was trying to update a quote item quantity programtically; but, it constantly throws an error "The requested quantity for". Can anybody please provide assistance to resolve this issue ? code follows:

$buyInfo = array(
    'qty' => 102,
$this->_quote->updateItem($quoteItemId, new Varien_Object($buyInfo))->save();

$this->_quote - Quote Object

$quoteItemId - Item Id Current quantity of the product in the quote: 100

Total stock of the product:150


2 Answers 2


Your Total qty for product is 150 and 100 is already added in quote so items available to add in quote is only 50 and you are trying to add 102

if your "super_attribute"=>array(175=>19) are not same as added in current quote it will add new item in quote.

  • :I had added the same super attributes to the quote. $product = Mage::getModel('catalog/product')->load(3); $buyInfo = array( 'qty' => 100, "super_attribute"=>array(175=>19) ); $this->_quote->addProduct($product , new Varien_Object($buyInfo))->save();
    – iqbalmp
    Commented Nov 19, 2015 at 5:31
  • I want just update the quantity from 100 to 102 in cart. Thanks!
    – iqbalmp
    Commented Nov 19, 2015 at 5:33
  • method updateItem() is adding old item + new item so it will be 100+102 = 202 Commented Nov 19, 2015 at 5:35
  • if ($resultItem->compare($item)) { // Product configuration is same as in other quote item $resultItem->setQty($resultItem->getQty() + $item->getQty()); $this->removeItem($item->getId()); break; } This is the case in updateItem() method Commented Nov 19, 2015 at 5:38

Yes, got it!

   $parentItem = $item->getParentItem() ?: $item; //Set quantity for parent item


It was that much simple :)

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