Bug 211703 Support muti-view on report item.
As title described.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/internal/CrosstabReportItemTask.java
MeasureViewHandle measureView = (MeasureViewHandle) measureList
						.get( j );
				String function = levelView
						.getAggregationFunction( measureView );
				if ( function == null )
				{
					functionList.add( DEFAULT_MEASURE_FUNCTION );
				}
				else
				{
					functionList.add( function );
				}
			}
			functionListMap.put( name, functionList );
			measureListMap.put( name, measureList );
		}
		
		
		
		List grandMeasureList = getAggregationMeasures( targetAxisType );
		List grandFunctionList = new ArrayList( );
		for ( int j = 0; j < grandMeasureList.size( ); j++ )
		{
			MeasureViewHandle measureView = (MeasureViewHandle) grandMeasureList
					.get( j );
			String function = getAggregationFunction( targetAxisType,
					measureView );
			if ( function == null )
			{
				grandFunctionList.add( DEFAULT_MEASURE_FUNCTION );