Does anyone know this information?? How is it done in RTC when I explore a baseline??

I have tried to use IScmService.activeChangeSet and activeChangeSetByComponent to get all the change-set in order to pass it to IScmService.ChangeSetsInBaseline, but I always obtain an empty array, while I'm having a baseline with a single change-set.

Currently I'm passing SyncTimes set to null. Do I have to change this param? And what can I use on it?

It seems that the two methods activeChangeSet referres only to change-set which does not belongs to a baseline...
So I tried a query in order to catch all the change-set in a component using

IChangeSetSearchCriteria csCriteria = IChangeSetSearchCriteria.FACTORY.newInstance();
csCriteria.setComponent(component);
IChangeSetHandle[] csRetrieved = scmQuery.findChangeSets(csCriteria, IScmQueryService.MAX_PAGE_SIZE, null, null);

but I've got this exception:

Illegal transaction in progress for service method call


This things is driving me quite crazy. I can't immagine that this cannot be easily done. It's the same thing that runs on client on PendingChanges View when a baseline is expanded.