Bug 156166 Error occour when previewing attached report in web viewer.
Decription:Error occour when previewing attached report in web viewer. Steps to reproduce: 1.run attached reports in web viewer. Expeceted results: preview properly Actual results: Error occour when previewing the reports in web viewer while it works properly in html and PDF
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/util/ExprDataReader2.java
this.rowIDMap.put( new Integer( currRowIndex ),
					new Integer( nextDestIndex ) );
		}
		return hasNext;
	}
	
	/**
	 *
	 */
	protected int getNextDestIndex( int currIndex )
	{
		return rowIndexUtil.read( );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IExprResultReader#getRowValue()
	 */
	public Map getRowValue( ) throws DataException
	{
		if ( lastRowIndex == currRowIndex )
			return this.exprValueMap;
		lastRowIndex = currRowIndex;
		try
		{
			this.skipTo( nextDestIndex );
			this.exprValueMap = this.getValueMap( );
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_LOAD_ERROR,