Magento Automatically set a product when a certain qty limit is reached: system -> configuration -> catalog -> inventory -> Qty for Item's Status to Become Out of Stock

As pointed out by @pitmeister,Allow qty Below 0 should disable this behavior.

The problem is:

  • I already have Allow qty Below 0 (frontend/backend works as expected so status is not changed)
  • BUT: I'm importing stock information using a third party extension and the import action set product out of stock in case the qty imported is 0.

How can I debug this ? Where is the code that change product stock status to out of stock because of the Qty ?

2 Answers 2


If you allow backorders (Allow qty Below 0), the setting 'Stock Availability' will not be set to Out of Stock once the product reaches qty = 0

  • Thanks, do you have idea where is the code related to it ?
    – Fra
    May 26, 2014 at 20:20
  • Take a look at Mage_CatalogInventory_Model_Resource_Stock::updateSetOutOfStock
    – pitmeister
    May 27, 2014 at 12:19
  • that method is called when you change the configuration setting Allow qty Below 0. I think it is meant to update the stock for the full catalog ... so it is not what I'm looking for
    – Fra
    May 27, 2014 at 13:55

The check for the qty is performed by verifyStock() and on the base of its output the status is set by _beforeSave() method:

  • Mage_CatalogInventory_Model_Stock_Item::_beforeSave()
  • Mage_CatalogInventory_Model_Stock_Item::verifyStock($qty = null)

In case you need to perform some programmatically stock changes, here there is a possible approach: change stock availability programmatically

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