public function canSubtractQty()
{
$hlp = Mage::helper('udropship');
$obs = Mage::getSingleton('udropship/observer');
if ($this->getAlwaysInStock()) {
$localVendorId = $hlp->getLocalVendorId();
if ($item = $obs->getOrderItem()) {
if ($item->getUdropshipVendor() != $localVendorId) {
return false;
}
} elseif ($quote = $obs->getQuote()) {
foreach ($quote->getAllItems() as $item) {
if ($item->getProductId() == $this->getProductId() && $item->getUdropshipVendor() != $localVendorId) {
return false;
}
}
}
}
return $hlp->hasMageFeature('stock_can_subtract_qty') ? parent::canSubtractQty() : true;
}
