Bug 213810 [2.2.2 acceptance] Error occurs when create a third axis.
description: Error occurs when create a third axis. build version: 2.2.2 v20071224-1008 steps to reproduce: 1. New a report. 2. New a datasource with sample DB and new a dataset with table payments. 3. New bar chart. 4. On Select Chart Type page, select Multi-Y Axis as More Axes. 5. On Select Data page, bind the dataset, select customernumber as Series1 of Axis1, create a secondary Axis, select PAYMENTDATE as Series1 of Axis2, create a third Axis. Expected result: The third Axis should be created correctly. Actual result: Error occurs: Unable to use a non-datetime data to render a datetime axis.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
if ( dtMin.equals( dtMax ) )
				{
					dtMin.setTimeInMillis( 0 );
				}
				return new Calendar[]{
						dtMin, dtMax
				};
			}
			catch ( ClassCastException ex )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_SET,
						"exception.numerical.data.datetime.axis",  
						Messages.getResourceBundle( rtc.getULocale( ) ) );
			}
		}
		else if ( ( iType & NUMERICAL ) == NUMERICAL )
		{
			try
			{
				double dMin = asDouble( oMin ).doubleValue( );
				double dMax = asDouble( oMax ).doubleValue( );
				if ( dMin == dMax )
				{
					if ( dMin > 0 )
					{
						dMin = 0;
					}
					if ( dMax < 0 )
					{