Sending messages from NW BPM to a third party

Hello Friends,

I am working on redesigning of a ccBPM to NW BPM. In the ccBPM, we were sending direct messages to a third party(file) and an ECC system(idoc).

But when converting this functionality to NWBPM, I think there is no option that we can send the messages from NW BPM to a third party directly, we have to involve PI.

I mean the only flow allowed is

PI -> NW BPM -> PI -> ECC

but not

PI -> NW BPM -> ECC.

Tried to find out whether we can send the messages to other parties / systems via BPM but didn't find any example nor in SAP documentation. So my assumption is that it is a must that we involve PI in between.

The only thing I can think of a system can work on XI 3.0 protocol via SOAP adapter, then its possible. Can you comment please.