Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
public boolean validateParameters( )
	{
		if ( runnable == null )
		{
			return false;
		}
		
		usingParameterValues( );
		if ( log.isLoggable( Level.FINE ) )
		{
			loggerParamters( );
		}
		
		return new ParameterVisitor( ) {
			boolean visitScalarParameter( ScalarParameterHandle param,
					Object value )
			{
				return validateScalarParameter( param );
			}
			boolean visitParameterGroup( ParameterGroupHandle group,
					Object value )
			{
				return visitParametersInGroup( group, value );
			}
		}.visit( (ReportDesignHandle) runnable.getDesignHandle( ), null );
	}
	protected void loggerParamters( )
	{
		if ( log.isLoggable( Level.FINE ) )
		{