public function changeExternalID($selector, $newValue, $forID = null)
    {
        $change['@removeExternalIds'] = 'ext:'.$selector.':';
        $change['id']                 = [is_null($forID) ? $this->getRecordID() : $forID,
            'ext:'.$selector.':'.$newValue];
        return $this->insertToFlexiBee($change);
    }