Bug 177296 Redundant Values are added to parameter list in preview mode.[0705]
Description: Redundant Values are added to parameter list in preview mode. Build number:2.2.0.v20070312 Steps to reproduce: 1. Open attached report. 2. Preview. 3. Select datetime value and click OK. 4. Click Show Report Parameters button, check values Expected result: Values are unchanged and only one datetime value in list. Actual result: Two same datetime values in list.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/presentation/aggregation/parameter/ComboBoxParameterFragment.java
* @param parameter
	 *            parameter definition reference.
	 */
	public ComboBoxParameterFragment( ParameterDefinition parameter )
	{
		super( parameter );
	}
	/**
	 * Override implementation of prepareParameterBean method
	 * 
	 * @see org.eclipse.birt.report.presentation.aggregation.parameter.ScalarParameterFragment#prepareParameterBean(javax.servlet.http.HttpServletRequest,
	 *      org.eclipse.birt.report.service.api.IViewerReportService,
	 *      org.eclipse.birt.report.context.ScalarParameterBean,
	 *      java.util.Locale)
	 */
	protected void prepareParameterBean( HttpServletRequest request,
			IViewerReportService service, ScalarParameterBean parameterBean,
			Locale locale ) throws ReportServiceException
	{
		ViewerAttributeBean attrBean = (ViewerAttributeBean) request
				.getAttribute( IBirtConstants.ATTRIBUTE_BEAN );
		assert attrBean != null;
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		Collection selectionList = null;
		ParameterDefinition paramDef = parameterBean.getParameter( );
		if ( paramDef.getGroup( ) != null && paramDef.getGroup( ).cascade( ) )
		{
			
			Map paramValues = attrBean.getParameters( );