docs: public void init(BaseField field, BaseField fldDest, Converter fldCheckMark, String fieldName)
      {
          BaseField fldSource = null;
          boolean bClearIfThisNull = true;
          boolean bOnlyIfDestNull = false;
          boolean bDontMoveNull = false;
          super.init(field, fldDest, fldSource, bClearIfThisNull, bOnlyIfDestNull, bDontMoveNull);
          this.setRespondsToMode(DBConstants.INIT_MOVE, false); // By default, only respond to screen and init moves
          this.setRespondsToMode(DBConstants.READ_MOVE, false);   // Usually, you only want to move a string on screen change
  
          this.fieldName = fieldName;
          m_convCheckMark = fldCheckMark;
      }