Is there a way to limit the backorder qty? ie: I want to allow a product to get back-ordered, but only by a few


2 Answers 2


Not that I know.

hacky way

The easy way is to raise all your qty by X where X is the number of backorders you want to allow.

better way

But you could deactivate the observer which checks it:


and implement your own with your qty. The problem is, the actual check is made here:


so the alternative is, to rewrite the catalog_inventory/stock_item model.


Further to Fabian's answer, you can see in Mage_CatalogInventory_Model_Stock_Item::checkQty there is the following:

public function checkQty($qty)
    if (!$this->getManageStock() || Mage::app()->getStore()->isAdmin()) {
        return true;

    if ($this->getQty() - $this->getMinQty() - $qty < 0) {
        switch ($this->getBackorders()) {
            case Mage_CatalogInventory_Model_Stock::BACKORDERS_YES_NONOTIFY:
            case Mage_CatalogInventory_Model_Stock::BACKORDERS_YES_NOTIFY:
                return false;
    return true;

This basically gives backorders a free pass on the quantity check.

To have the non-backorder checks (e.g. 'Some of the products are currently out of stock' and 'The requested quantity for product is not available') apply you need three things:

  1. a way to set the allowed backorder quantity per product.
  2. use this attribute in checkQty (or similar).
  3. have checkQty return false if cart quantity + quantity sold exceeds allowed quantity.

More details here: https://magento.stackexchange.com/a/41361/788

An extension I wrote to do this is here: https://github.com/etailer/etailer_backorders

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.