Bug 136246 [regression]Export data exported error column name.
Description: Export data exported error column name. Steps to reproduce: 1. export data in a table, select several columns. Expected result: Selected column name and data are exported. Actual result: No matter what columns you selected, exported columns name always display columns beginning from the first, and then the second, and so on.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
String configValue = (String) configVars.get( paramName );
				ReportParameterConverter cfgConverter = new ReportParameterConverter(
						format, Locale.US );
				paramValueObj = cfgConverter.parse( configValue, parameterObj
						.getDataType( ) );
			}
			else
			{
				paramValueObj = task.getDefaultValue( parameterObj.getName( ) );
			}
			params.put( paramName, paramValueObj );
		}
		return params;
	}
	/**
	 * Check whether missing parameter or not.
	 * 
	 * @param task
	 * @param parameters
	 * @return
	 */
	public boolean validateParameters( IGetParameterDefinitionTask task,
			Map parameters )
	{
		assert task != null;
		assert parameters != null;
		boolean missingParameter = false;
		Collection parameterList = task.getParameterDefns( false );
		for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )
		{