Bug 312761 It makes no difference changing the series labels position in Radar chart.[13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/type/impl/PieSeriesImpl.java
setExplosionExpression( EXPLOSION_EXPRESSION_EDEFAULT );
				return;
			case TypePackage.PIE_SERIES__TITLE :
				setTitle( (Label) null );
				return;
			case TypePackage.PIE_SERIES__TITLE_POSITION :
				unsetTitlePosition( );
				return;
			case TypePackage.PIE_SERIES__LEADER_LINE_ATTRIBUTES :
				setLeaderLineAttributes( (LineAttributes) null );
				return;
			case TypePackage.PIE_SERIES__LEADER_LINE_STYLE :
				unsetLeaderLineStyle( );
				return;
			case TypePackage.PIE_SERIES__LEADER_LINE_LENGTH :
				unsetLeaderLineLength( );
				return;
			case TypePackage.PIE_SERIES__SLICE_OUTLINE :
				setSliceOutline( (ColorDefinition) null );
				return;
			case TypePackage.PIE_SERIES__RATIO :
				unsetRatio( );
				return;
			case TypePackage.PIE_SERIES__ROTATION :
				unsetRotation( );
				return;
			case TypePackage.PIE_SERIES__CLOCKWISE :
				unsetClockwise( );
				return;
		}