Bug 198270 Copying an aggregate does not make a copy, only a reference
In a table with groups or multiple columns, create an aggregate in a footer or a header. Copy the aggregate to another cell in a footer or a header. Make changes to the new aggregate appropriate to its new location. Expected result: The changes appear in only the new copy of the aggregate. Actual result: The changes appear in both aggregates because the new aggregate is not a copy, but a reference to the same aggregate as the original.
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
if ( isAggregate( ) )
		{
			initFunction( );
			initDataFields( );
			initFilter( );
			initAggOn( );
		}
		validate( );
	}
	private void initAggOn( )
	{
		try
		{
			CrosstabReportItemHandle xtabHandle = (CrosstabReportItemHandle) ( (ExtendedItemHandle) getBindingHolder( ) ).getReportItem( );
			String[] aggOns = getAggOns( xtabHandle );
			cmbAggOn.setItems( aggOns );
			String aggstr = "";
			if ( getBinding( ) != null )
			{
				List aggOnList = getBinding( ).getAggregateOnList( );
				int i = 0;
				for ( Iterator iterator = aggOnList.iterator( ); iterator.hasNext( ); )
				{
					if ( i > 0 )
						aggstr += ",";
					String name = (String) iterator.next( );
					aggstr += name;
					i++;
				}
			}