For example, with WS-BA:
Here addToBasket() can be called multiple times within the same transaction. The default behaviour should be to enlist a single participant, rather than one per Service-invocation.
If the transaction is compensated, 'removeFromBasket' is invoked once. A single participant is registered, per transaction, even if many calls to a method annotated with @ServiceRequest occur.
Similar functionality should be provided for WS-AT services.