/**
  * @param Mage_Core_Model_Config_Data $object
  * @return Mage_Core_Model_Config_Data
  */
 protected function checkConfigUnique(Mage_Core_Model_Config_Data $object)
 {
     /** @var $collection Mage_Core_Model_Mysql4_Config_Data_Collection | Mage_Core_Model_Resource_Config_Data_Collection */
     $collection = $this->getFactory()->getModelCoreConfigData()->getCollection();
     $collection->addFieldToFilter('scope', $object->getScope());
     $collection->addFieldToFilter('scope_id', $object->getScopeId());
     $collection->addFieldToFilter('path', $object->getPath());
     $collection->load();
     if ($collection->count() > 0) {
         /** @var $config Mage_Core_Model_Config_Data */
         $config = $collection->getFirstItem();
         $object->setId($config->getId());
     }
     return $object;
 }