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
SeriesDefinition baseSD = ChartUIUtil.getBaseSeriesDefinitions( context.getModel( ) )
				.get( 0 );
		for ( SeriesDefinition orthSD : ChartUIUtil.getOrthogonalSeriesDefinitions( context.getModel( ),
				0 ) )
		{
			if ( !isValid )
			{
				break;
			}
			Series oSeries = orthSD.getDesignTimeSeries( );
			isValid = getSeriesUIProvider( oSeries ).isValidAggregationType( oSeries,
					orthSD,
					baseSD );
		}
		return isValid;
	}
	/**
	 * Get the compatible axis type according to series type.
	 * 
	 * @param series
	 * @return NameSet
	 * @since 2.3
	 */
	public static NameSet getCompatibleAxisType( Series series )
	{
		ISeriesUIProvider provider = getSeriesUIProvider( series );
		AxisType[] types = provider.getCompatibleAxisType( series );
		String[] names = new String[types.length];
		for ( int i = 0; i < types.length; i++ )
		{