Jazz DW Data Source

Is there any necessary setting before I can use the "Jazz DW Data
Source" in my report?

I just created a sample report, and created a new "Jazz DW Data Source",
point to my local server and any snapshot. When I clicked the "Test
Connection" button, there was always a "Ping failed", the detail is:

org.eclipse.datatools.connectivity.oda.OdaException ;
com.ibm.team.repository.common.TeamRepositoryException: need to pass
service app context to data source
at
com.ibm.team.reports.common.oda.generic.GenericConnection.open(GenericConnection.java:45)

at
org.eclipse.datatools.connectivity.oda.consumer.helper.OdaConnection.open(OdaConnection.java:235)

at
org.eclipse.datatools.connectivity.oda.profile.OdaConnectionWrapper.open(OdaConnectionWrapper.java:209)

at
org.eclipse.datatools.connectivity.oda.profile.OdaConnectionWrapper.<init>(OdaConnectionWrapper.java:59)

at
org.eclipse.datatools.connectivity.oda.profile.OdaConnectionFactory.createConnection(OdaConnectionFactory.java:26)

at
org.eclipse.datatools.connectivity.internal.ConnectionFactoryProvider.createConnection(ConnectionFactoryProvider.java:77)

at
org.eclipse.datatools.connectivity.internal.ConnectionProfile.createConnection(ConnectionProfile.java:354)

at
org.eclipse.datatools.connectivity.ui.PingJob.run(PingJob.java:57)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: com.ibm.team.repository.common.TeamRepositoryException: need
to pass service app context to data source
at
com.ibm.team.reports.service.internal.ServiceConnection.getSnapshotDescriptor(ServiceConnection.java:35)

at
com.ibm.team.reports.common.oda.generic.GenericConnection.open(GenericConnection.java:43)

... 8 more

I tried both 0.6M1U1 and 0.6M2.

Any help/suggestions will be appreciated!

Some new findings:

I tried reports in com.ibm.team.examples.reports.client.

If I deploy them in my local Jazz server and run reports from Jazz
clients (Eclipse or Web), reports will be run correctly.
Checking codes can see that Jazz services (like ReportViewerService)
will set the app context (containing IDataWarehouseService instance) to
ServiceConnection correctly.

But if I open those report designs in "Report Design" perspective
directly, and try to preview, there will be errors (Cannot open the
connection for the driver: com.ibm.team.reports.generic.dataSource).
The ServiceConnection.setAppContext method never invoked in this
scenario, so the ServiceConnection can't get IDataWarehouseService
instance.

Sorry I'm a newbie to the team reports. Now the problem is, how can I
design and preview reports using Jazz DW data source in "Report Design"?

Any ideas/suggestions will be appreciated!