code: public function pnrAddMultiElements(RequestOptions\PnrAddMultiElementsOptions $options, $messageOptions = [])
      {
          $msgName = 'PNR_AddMultiElements';
  
          return $this->callMessage($msgName, $options, $messageOptions);
      }
docs: PNR_AddMultiElements - Create a new PNR or update an existing PNR.
  
  https://webservices.amadeus.com/extranet/viewService.do?id=25&flavourId=1&menuId=functional
  
  @param RequestOptions\PnrAddMultiElementsOptions $options
  @param array $messageOptions (OPTIONAL)
  @return Result
  @throws Client\InvalidMessageException
  @throws Client\RequestCreator\MessageVersionUnsupportedException
  @throws Exception