Bug 202398 Aggregaton for List can not aggregate on group [0001]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
if ( isRef )
			{
				if ( getBinding( ) == null )
				{
					for ( Iterator iterator = getBindingHolder( ).getDataBindingReference( )
							.getColumnBindings( )
							.iterator( ); iterator.hasNext( ); )
					{
						ComputedColumnHandle computedColumn = (ComputedColumnHandle) iterator.next( );
						if ( isAggregate( ) )
						{
							if ( computedColumn.getAggregateFunction( ) == null
									|| computedColumn.getAggregateFunction( )
											.equals( "" ) )
								continue;
						}
						else
						{
							if ( computedColumn.getAggregateFunction( ) != null
									&& !computedColumn.getAggregateFunction( )
											.equals( "" ) )
								continue;
						}
						cmbName.add( computedColumn.getName( ) );
					}
				}
				else
				{
					setDisplayName( getBinding( ).getDisplayName( ) );
					for ( int i = 0; i < DATA_TYPE_CHOICES.length; i++ )