Bug 312761 It makes no difference changing the series labels position in Radar chart.[13]
chart/org.eclipse.birt.chart.ui/src/org/eclipse/birt/chart/ui/util/ChartUIUtil.java
.getGroupType( );
			if ( queryDataType == DataType.NUMERIC_LITERAL
					&& groupDataType == DataType.DATE_TIME_LITERAL )
			{
				return groupDataType.getName( );
			}
			else if ( queryDataType == DataType.TEXT_LITERAL
					&& groupDataType != DataType.TEXT_LITERAL )
			{
				return groupDataType.getName( );
			}
		}
		return isConsistent;
	}
	private static String checkGroupTypeOnYGrouping(
			ChartWizardContext context, Chart chart )
	{
		String isConsistent = ""; 
		SeriesDefinition seriesdefinition = ChartUIUtil.getOrthogonalSeriesDefinitions( chart,
				0 )
				.get( 0 );
		if ( seriesdefinition.getQuery( ) != null )
		{
			DataType queryDataType = context.getDataServiceProvider( )
					.getDataType( seriesdefinition.getQuery( ).getDefinition( ) );
			if ( queryDataType != null
					&& seriesdefinition.getQuery( ).getGrouping( ) != null )
			{
				DataType groupDataType = seriesdefinition.getQuery( )
						.getGrouping( )