code: private boolean isContainResponse(IntuitMessage intuitMessage, int idx)
      {
          List<AttachableResponse> response = ((IntuitResponse) intuitMessage.getResponseElements().getResponse()).getAttachableResponse();
          if(null == response)          { return false; }
          if(0    >= response.size() )  { return false; }
          if(idx  >= response.size() )  { return false; }
          return true;
      }
docs: verifies availability of an object in response
  @param intuitMessage
  @param idx
  @return