oldGroupingUnit, groupingUnit));
oldGroupingUnit, groupingUnit, !oldGroupingUnitESet));
    public void setGroupingUnit(String newGroupingUnit)    {        String oldGroupingUnit = groupingUnit;        groupingUnit = newGroupingUnit;        if (eNotificationRequired())            eNotify(new ENotificationImpl(this, Notification.SET, DataPackage.SERIES_GROUPING__GROUPING_UNIT,                oldGroupingUnit, groupingUnit));    }