Bug 210635 Incorrect preview of chart after reverse categories.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
else
					{
						final CDateTime cdtV2 = asDateTime( oV2 );
						final CDateTime cdtMax = asDateTime( oMax );
						if ( cdtV2.after( cdtMax ) )
						{
							oMax = cdtV2;
						}
					}
				}
			}
		}
		
		if ( bAnyStacked || ax.isPercent( ) )
		{
			if ( ax.getType( ).getValue( ) == AxisType.DATE_TIME )
			{
				throw new IllegalArgumentException( MessageFormat.format( Messages.getResourceBundle( rtc.getULocale( ) )
						.getString( "exception.stacked.datetime.axis.series" ), 
						new Object[]{
							ax
						} ) );
			}
			Object oValue;
			int iSeriesPerGroup;
			double dPercentMax = 0, dPercentMin = 0;
			double dAxisMin = Double.MAX_VALUE, dAxisMax = -Double.MAX_VALUE;
			ArrayList alSeriesGroupsPerAxis = ssl.getStackGroups( ax );
			ArrayList alSeriesPerGroup;
			StackGroup sg;