function preDelete($fieldsetName, $fieldName, $fieldValue, &$deleteSql)
 {
     global $REX;
     if ($fieldsetName == $this->getFieldsetName() && $fieldName == 'name') {
         // Vorm löschen, Prefix wieder anfügen
         return $this->addPrefix($fieldValue);
     }
     return parent::preDelete($fieldsetName, $fieldName, $fieldValue, $deleteSql);
 }