Bug 122854 There is redundant columns in "available columns" list in "export data" dialog.
Description: There is redundant columns in "available columns" list in "export data" dialog. Steps to reproduce: 1. Preview attached design in web viewer. 2. Select the table and click on "export" button. 3. There is a "detail" column name in "available columns" list which is not data set column.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/Report.java
*/
	protected String basePath;
	/**
	 * The prefix of style name
	 */
	public static final String PREFIX_STYLE_NAME = "style_"; 
	/**
	 * default constructor.
	 */
	public Report( )
	{
	}
	
	/**
	 * set report item id to report item instance
	 * 
	 * @param id the report item component id
	 * @param rptItem the report item
	 */
	public void setReportItemInstanceID( long id, ReportElementDesign rptElement )
	{
		if( mapReportItemIDtoInstance == null )
		{
			mapReportItemIDtoInstance = new HashMap( );
		}
		mapReportItemIDtoInstance.put( new Long( id ), rptElement );
	}
	
	/**
	 * return the report item with the specific component ID