@Override
	public String getSheetName()
	{
		if( sheetname == null )
		{
			if( parent_rec != null )
			{
				WorkBook wb = parent_rec.getWorkBook();
				if( (wb != null) && (wb.getExternSheet() != null) )
				{    // 20080306 KSC: new way is to get sheet names rather than sheets as can be external refs
					String[] sheets = wb.getExternSheet().getBoundSheetNames( ixti );
					if( (sheets != null) && (sheets[0] != null) )
					{
						sheetname = sheets[0];
					}
				}
			}
		}
		return sheetname;
	}