cart.php "there is not enough product in stock"

[cweeks]

Hi,

Can anyone explain to me the conditions that need to occur to make the "there is not enough product in stock" error messages appear in this excert of code from cart.php. In particular the 2nd one ?

Cheers, Cam.

           /* Check the quantity availability */
           if ($idProductAttribute AND is_numeric($idProductAttribute))
           {
               if (!$delete AND !$producToAdd->isAvailableWhenOutOfStock($producToAdd->out_of_stock) AND !Attribute::checkAttributeQty(intval($idProductAttribute), intval($qty)))
                   $errors[] = Tools::displayError('there is not enough product in stock');
           }
           elseif ($producToAdd->hasAttributes() AND !$delete)
           {
               $idProductAttribute = Product::getDefaultAttribute(intval($producToAdd->id), intval($producToAdd->out_of_stock) == 2 ? !intval(Configuration::get('PS_ORDER_OUT_OF_STOCK')) : !intval($producToAdd->out_of_stock));
               if (!$idProductAttribute)
                   Tools::redirectAdmin($link->getProductLink($producToAdd));
               elseif (!$delete AND !$producToAdd->isAvailableWhenOutOfStock($producToAdd->out_of_stock) AND !Attribute::checkAttributeQty(intval($idProductAttribute), intval($qty)))
                   $errors[] = Tools::displayError('there is not enough product in stock');
           }
           elseif (!$delete AND !$producToAdd->checkQty(intval($qty)))
               $errors[] = Tools::displayError('there is not enough product in stock');