Bug 145478 Unable "Select Value" in the Join data set's filter
Step to reproduce: 1.new a join data set(please use the attached file) 2.right click the dataset and click the Edit 3.go to the Filter pane and set a filer 4.click the list of Value1 Actual result: A warning pop up and cant select Value.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
* 
	 * @param dataSet
	 * @return
	 * @throws BirtException
	 */
	public IPreparedQuery prepareQuery( DataSetHandle dataSet,
			IQueryDefinition query ) throws BirtException
	{
		DataRequestSession session = getDataRequestSession( dataSet );
		getDataSetDesign( dataSet, true, true );
		return session.prepare( query, null );
	}
	
	/**
	 * 
	 * @param dataSet
	 * @return
	 * @throws BirtException
	 */
	public IPreparedQuery prepareQuery( DataSetHandle dataSet,
			IQueryDefinition query, boolean useColumnHints, boolean useFilters )
			throws BirtException
	{
		DataRequestSession session = getDataRequestSession( dataSet );
		getDataSetDesign( dataSet, useColumnHints, useFilters );
		return session.prepare( query, null );
	}
	
	/**
	 * Gets prepared query, given Data set, Parameter binding, and