Bug 209450 [regression]Duplicate values display in Cascading parameter list[0705]
Descripption: Duplicate values display in Cascading parameter list Build number:2.3.0.v20071112 Steps to reproduce: 1. New sample data source and dataset from CUSTOMERS. 2. New a cascading parameter from COUNTRY, STATE AND CITY fields. 3. Preview. Expected result: Values in three parameter list aren't duplicated. Actual result: Duplicate values show in parameter list. Error log:n/a
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
parameterDefns = new ArrayList( );
		while ( iter.hasNext( ) )
		{
			ParameterDefnBase pBase = (ParameterDefnBase) iter.next( );
			try
			{
				parameterDefns.add( pBase.clone( ) );
			}
			catch ( CloneNotSupportedException e ) 
			
			{
				log.log( Level.SEVERE, e.getMessage( ), e );
			}
		}
		if ( parameterDefns != null )
		{
			iter = parameterDefns.iterator( );
			while ( iter.hasNext( ) )
			{
				IParameterDefnBase pBase = (IParameterDefnBase) iter.next( );
				if ( pBase instanceof ScalarParameterDefn )
				{
					( (ScalarParameterDefn) pBase )
							.setReportDesign( (ReportDesignHandle) runnable
									.getDesignHandle( ) );
					( (ScalarParameterDefn) pBase ).setLocale( locale );
					( (ScalarParameterDefn) pBase ).evaluateSelectionList( );
				}
				else if ( pBase instanceof ParameterGroupDefn )