Bug 153514 [Regression]Can't Drill-Through to reportdesign which is in the current path
Description: Can't Drill-Through to reportdesign which is in the current path Step to reproduce: 1. new a report named "target.rptdesign" and add label 2. new another report named "Drillthrough.rptdesign" and also add a label in it 3. Choose the lable in second report and edit its Hyperlink: Drill through target.rptdesign 4. preview it by any form Excepted result: Target.rptdesign can be drill-throughed Actual result: Display "The design file /D:/Eclipses/eclipse200608110630/plugins/org.eclipse.birt.report.viewer_2.1.0.v20060811-0630/birt/documents/4F9E34353BCD20DC7687037D6B8B7A25/Acceptance/Target.rptdesign can not be found. " But if Drill-Through with absolute path is ok.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/ReportDocumentReader.java
{
				createPageHintReader( );
			}
			if ( pageHintReader != null )
			{
				try
				{
					return pageHintReader.findPage( offset );
				}
				catch ( IOException ex )
				{
					logger.log( Level.WARNING,
							"Failed to find page which contains " + iid, ex );
				}
			}
		}
		return -1;
	}
	public long getInstanceOffset( InstanceID iid )
	{
		if ( !isComplete() )
		{
			return -1l;
		}
		if ( iid == null )
		{
			return -1l;
		}
		if ( reportletsIndexById == null )
		{