A backloop to a task in a subprocess

Ivo, I think it is not allowed in BPMN to create direct connections from a high-level process directly to a sub-sub-process as shown in the faked model below (and AE consequently doesn't allow this).

The only quick ideas I come up with is either

• to create a proper linking as shown in the upper graphic (which has a correct leveling, but doesn't meet your requirement), or
• to use the signal event after F that get's "caught" just before E2 in the lower graphic.

Thank you, Roland! The signal one seems like a good solution although it doesn't feel right to use a broadcasting device for a local communication. It somehow creates qualms about conformance and ... efficiency :)

And the real situation is that there a several such cases in a single process and yes there is a good reason to keep subprocesses. Then it have to be imported in ARIS. (Speaking of which, when will ARIS be capable of simulating BPMN2 ?)

So, I'm looking forward to other suggestions as well.

I agree that the signal might seem weird, but every time I see a complex modeling (in either notation) there is most likely another way to do this in an easier way - like splitting the process in multiple processes or -in case of BPMN- split it in call activities. 

I can imagine that the subprocess D might be easily "outsourced" into another process model.

Although refactoring is probably the best way, the signal solution does not feel "wrong" to me (see for instance figure 10.48 from BPMN 1.2 spec, where a signal is used to synchronize two sub-processes at the same level).