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
return;
		CommandStack stack = crosstab.getCommandStack( );
		stack
				.startTrans( Messages
						.getString( "CrosstabReportItemTask.msg.set.aggregate.function" ) ); 
		try
		{
			for ( int j = 0; j < measureView.getAggregationCount( ); j++ )
			{
				AggregationCellHandle cell = measureView.getAggregationCell( j );
				if ( ( axisType == COLUMN_AXIS_TYPE && cell
						.getAggregationOnColumn( ) == null )
						|| ( axisType == ROW_AXIS_TYPE && cell
								.getAggregationOnRow( ) == null ) )
				{
					CrosstabModelUtil.setAggregationFunction( crosstab, cell,
							function );
				}
			}
		}
		catch ( SemanticException e )
		{
			stack.rollback( );
			throw e;
		}
		stack.commit( );
	}
	/**
	 * Moves the dimension view with the given name to the target index in the
	 * target row/column. The axis type can be either