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
.getAggregationCell( rowDimension,
												rowLevel, colDimension,
												colLevel );
								if ( aggCell != null )
								{
									aggCell.getModelHandle( ).drop( );
								}
							}
						}
					}
				}
				
				
				if ( srcCrosstabView.getGrandTotal( ) != null )
				{
					for ( int i = 0; i < crosstab.getMeasureCount( ); i++ )
					{
						MeasureViewHandle mv = crosstab.getMeasure( i );
						AggregationCellHandle aggCell = mv.getAggregationCell(
								null, null, null, null );
						if ( aggCell != null )
						{
							String function = getAggregationFunction(
									srcCrosstabView.getAxisType( ), mv );
							aggCell.getModelHandle( ).drop( );
							
							transferMeasureList.add( mv );
							transferFunctionList.add( function );
						}
					}