BW parallel processing

Long lasting activities are put into spawned processes. Spawned processes share responses via Wait/Notify BW mechanism. Schema for response is a choice of all results/errors from all called activities. First wait can get response from any spawned process, the same if for subsequent Wait calls.

How to make compensations for this kind of process? Subprocess after failed notify should revert its actions, main process does necessery waiting and responds to client with success or error, when from first wait we get fatal error which should break other subprocess call, we do not wait for other calls - they will be reverted.