Bug 200500 Error happens while share result set from item behind it.[0005]
Description: Error happens while share result set from item behind it. Build number:2.2.1.v20070820 Steps to reproduce: 1. New sample data source and dataset. 2. Drag the dataset to Layout and name it t1. 3. Insert a table before t1 and share result set from t1. 4. Preview. Expected result: If this situation isn't supported by Engine, at least we should provide friendly error message. Actual result: Error happened while running the report. Error log:n/a
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryResults.java
* @param queryService
	 * @param queryScope
	 * @param nestedLevel
	 * @throws DataException 
	 */
	QueryResults( IServiceForQueryResults queryService ) throws DataException
	{
		logger.entering( QueryResults.class.getName( ),
				"QueryResults",
				queryService );
		assert queryService != null;
		this.queryService = queryService;
		this.context = queryService.getContext( );
		this.queryScope = queryService.getScope( );
		this.nestedLevel = queryService.getNestedLevel( );
		
		logger.exiting( QueryResults.class.getName( ), "QueryResults" );
	}
		
	/*
	 * @see org.eclipse.birt.data.engine.api.IQueryResults#getName()
	 */
	public String getID( )
	{
		if ( selfQueryResultID == null )
			selfQueryResultID = QueryResultIDUtil.nextID( );
		return QueryResultIDUtil.buildID( rootQueryResultID, selfQueryResultID );
	}
	
	/*