How to override HTTP status code in SOA-P 5 HTTP Gateway - Red Hat Customer Portal

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Issue

I have a question regarding setting specific http codes in a rest response.
The scenario and request flow is as below:

platform A <-> B:Jboss ESB (HTTP Gateway + Restful/http router) <-> C: restful service

The response from C is http return code only. when it returns "400 Bad Request", B needs to forward 400 to A. Obviously http return code from B to A is 200.
How can I override 200 with 400 in ESB as A retrieves http request code only?

Environment

Red Hat JBoss SOA Platform (SOA-P) 5

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