Bug 132914 "Invalid page number" error message is hard coded.
"Invalid page number" error message is hard coded in DocumentProcessor.java. This must be externalized into *.properties file. If there are other hard coded error messages, please also externalize.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/presentation/aggregation/parameter/ParameterGroupFragment.java
* Get report parameters from engine.
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @return target jsp pages
	 * @exception ServletException
	 * @exception IOException
	 */
	protected void doService( HttpServletRequest request,
			HttpServletResponse response ) throws ServletException, IOException
	{
		ViewerAttributeBean attrBean = (ViewerAttributeBean) request
				.getAttribute( "attributeBean" ); 
		assert attrBean != null;
		assert parameterGroup != null;
		ParameterGroupBean parameterGroupBean = new ParameterGroupBean(
				parameterGroup );
		attrBean.setParameterBean( parameterGroupBean );
		
		String displayName = parameterGroup.getPromptText( );
		displayName = ( displayName == null || displayName.length( ) <= 0 )
				? parameterGroup.getDisplayName( )
				: displayName;
		displayName = ( displayName == null || displayName.length( ) <= 0 )
				? parameterGroup.getName( )
				: displayName;
		displayName = ParameterAccessor.htmlEncode( displayName );
		parameterGroupBean.setDisplayName( displayName );