I know how to make synchronous successful messages show up in SXI_MONITOR. In SXMB_ADM => Integration Engine Configuration => (button) Configuration I set RUNTIME | LOGGING_SYNC to 1.
But point-to-point web service calls (not going via XI/PI/PO) only show up on SRT_MONI (if I understand this correctly). However, I don't see the successful synchronous calls there. Is it possible to activate this?