Bug 214197 [Regression] Auto scale does not work correctly [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/AutoScale.java
if ( _dStart != -1 )
		{
			dStart = _dStart;
		}
		if ( _dEnd != -1 )
		{
			dEnd = _dEnd;
		}
		if ( atcTickCoordinates != null )
		{
			atcTickCoordinates.setEndPoints( dStart, dEnd );
		}
	}
	/**
	 * Computes tick count
	 * 
	 * @return tick count
	 */
	public final int getTickCount( ) throws ChartException
	{
		if ( this.oStepNumber != null )
		{
			if ( bCategoryScale || ( iType & NUMERICAL ) != NUMERICAL )
			{
				
				logger.log( new ChartException( ChartEnginePlugin.ID,
						ChartException.GENERATION,
						"exception.unsupported.step.number", 
						Messages.getResourceBundle( rtc.getULocale( ) ) ) );
			}