Sender and Target SI are both Outbound

Hi Experts,

I was wondering, what happens to the message if you use an outbound SI for your sender and an outbound SI as your receiver?

The rest of the build is the usual: message types are right, correct sender and receiver communication channels, ICO. However, when I checked the the SI that was being used, I noticed that the same outbound SI is used as both sender and receiver interface. What kind of error will appear in PI (if any error will) should this configuration stay as is?