Hi Iñaki,
unfortunatelly using sender RFC is behavior of SAP standard content (and HCM system behavior) for this process. So I cannot revert to ABAP proxy, which would be my natural choice if I could implement on a green field approach.
You said
"the general recommendation is to use SAP Gateway to register the RFC Sender Channel that is on the same host as the RFC Sender Channel's AE", this means that it's recommendable to have the gateway nearest possible to the PI.
Wouldn't that mean using the PIs very own gateway then? One couldn't get more near then that, right? :-) As said I'm on PI 7.4 AEX with a central adapter engine (no decentral adapter engines in place).
Thanks and kind regards
Jens