Stop CI Messages from showing up in process scheduler

PeopleTools 8.58.10, FS/SCM 9.2 PUM 47

TLDR: how to get Application Engine not to show messages in message log from Component Interface.

I have an application engine that calls a component interface, first getting the %Session and then setting the PsMessagesMode to 1. I manually handle messages and write them to a file.

However, the messages ALSO show up in the Process Scheduler message logs, as if I had calle MessageBox manually.

Is there a way to stop the messages returned by the CI from showing up in the process scheduler message log?