private function _convertCancelOrderReference($request) {
        
        $parameters = array();
        $parameters['Action'] = 'CancelOrderReference';
        if ($request->isSetSellerId()) {
            $parameters['SellerId'] =  $request->getSellerId();
        }
        if ($request->isSetAmazonOrderReferenceId()) {
            $parameters['AmazonOrderReferenceId'] =  $request->getAmazonOrderReferenceId();
        }
        if ($request->isSetCancelationReason()) {
            $parameters['CancelationReason'] =  $request->getCancelationReason();
        }

        return $parameters;
    }