Identify a 'merged change set' original change set

(RTC 4.0.6) Java API.

Hi

I’m trying to find the link / relationship between a merged change set and its original change set, to find the associated work item on the original change set.

I am querying the difference between a baseline and a snapshot, and I get the expected number of new change sets, but because the merge change set is created from another change set the association to the work item is not directly obvious (to me anyway).

Within Eclipse I can see the association when you expand the merge change set, this is what I am after finding programmatically.

Is there a way of navigating from a 'change set handle' of a merge change set to the change set from which it was produced?

Thanks.