Calling a VS and receiving 500 when the backend service replies with 201

When I’m calling a Soap VS in cestrasite, the call to the backend works fine but when the http status is 201 Mediator translates it to a 500 thus returning a Soap Fault instead of the success reply we’re expecting.

My question:
Is the the expected behaviour from Mediator?
Is there any place in the documentation I can found it written?

webMethods Integration Server
Version 9.7.0.0
Updates IS_9.7_Core_Fix14
IS_9.7_SPM_Fix1
IS_9.7_SPM_Fix3

CentraSite
Build Date: 2016-12-12 20:50:00
Build Number: 961
Version: 9.7.0.29