docs: public int doMergeData(Object objData)
      {
          int iErrorCode = DBConstants.NORMAL_RETURN;
          FieldListener nextListener = (FieldListener)this.getNextListener();
          if (nextListener != null)
              iErrorCode = nextListener.doMergeData(objData);
          else if (m_owner != null)
              iErrorCode = this.getOwner().doMergeData(objData);
          return iErrorCode;
      }