Bug 212370 [Regression] Negative value can not be shown both in chart builder and when preview [13]
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
else
					{
						final CDateTime cdtV1 = asDateTime( oV1 );
						final CDateTime cdtMin = asDateTime( oMin );
						if ( cdtV1.before( cdtMin ) )
						{
							oMin = cdtV1;
						}
					}
				}
				if ( oV2 != null ) 
				{
					if ( oMax == null )
					{
						oMax = oV2;
					}
					else
					{
						final CDateTime cdtV2 = asDateTime( oV2 );
						final CDateTime cdtMax = asDateTime( oMax );
						if ( cdtV2.after( cdtMax ) )
						{
							oMax = cdtV2;
						}
					}
				}
			}
		}
		
		if ( bAnyStacked || ax.isPercent( ) )