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
if ( dsHandle.getName( )
						.equals( ( (IJointDataSetDesign) dataSetDesign ).getLeftDataSetDesignName( ) )
						|| dsHandle.getName( )
								.equals( ( (IJointDataSetDesign) dataSetDesign ).getRightDataSetDesignName( ) ) )
				{
					getDataSetDesign( dsHandle, true, true );
				}
			}
		}
	}
	/**
	 * 
	 * @param dataSet
	 * @return
	 * @throws BirtException
	 */
	public DataRequestSession getDataRequestSession( DataSetHandle dataSet )
			throws BirtException
	{
		if ( sessionTable.get( dataSet.getName( ) ) != null )
			return (DataRequestSession) sessionTable.get( dataSet.getName( ) );
		else
		{
			DataSessionContext context = new DataSessionContext( DataSessionContext.MODE_DIRECT_PRESENTATION,
					dataSet.getModuleHandle( ) );
			DataRequestSession session = DataRequestSession.newSession( context );
			sessionTable.put( dataSet.getName( ), session );
			return session;
		}
	}