docs: public int checkRequestParams(Rec record)
      {
          int iMessageStatus = DATA_VALID;
          if (m_messageDataDescChildren != null)
          {
              for (String strKey : m_messageDataDescChildren.keySet())
              {
                  MessageDataDesc messageDataDesc = m_messageDataDescChildren.get(strKey);
                  iMessageStatus = messageDataDesc.checkRequestParams(record);
                  if (iMessageStatus != DATA_VALID)
                      break;
              }
          }
          return iMessageStatus;    // Override this
      }