protected function _modifyRulesChecker(Event $event)
    {
        $rulesChecker = $event->subject->viewVars['rulesChecker'];

        foreach ($rulesChecker as $key => $config) {
            if (Hash::get($config, 'extra') !== 'Versions' || $key !== 'version_id') {
                continue;
            }

            unset($rulesChecker[$key]);
        }

        return $rulesChecker;
    }