CXFRS Consumer not returning valid http response status code

Issue

• FLow is Client ->CXFRS ProxyService -> Backend Service.
• Producer of CXFRS Proxy is receving a 400 status code from backend rest service, but somehow consumer is returning 200 status code back to the client. I can see CamelHttpResponseCode header value is being set as 400, but not sure why 200 is being returned. Here below the header list.

{Cache-Control=no-cache, no-store, CamelHttpResponseCode=400,  connection=close, Content-Security-Policy=referrer origin,  content-type=application/json;charset=utf-8, Date=Mon,  05 Jun 2017 02:19:55 GMT, Expires=Thu, 01 Jan 1970 00:00:00 GMT, Pragma=no-cache, Set-Cookie=PF=pIk30AGiih66zv7A0PQaWG;Path=/;Secure;HttpOnly,  transfer-encoding=chunked, X-Frame-Options=SAMEORIGIN}

• Logs

21:17:16,022 | INFO  | tp1697624927-211 | LoggingInInterceptor             | 74 - org.apache.cxf.cxf-core - 3.0.4.redhat-621084 | Inbound Messagen  | ----------------------------n  | ID: 4n  | Response-Code: 400n  | Encoding: UTF-8n  | Content-Type: application/json;charset=utf-8n  | Headers: {Cache-Control=[no-cache, no-store], connection=[close], Content-Security-Policy=[referrer origin], content-type=[application/json;charset=utf-8], Date=[Mon, 05 Jun 2017 02:17:15 GMT], Expires=[Thu, 01 Jan 1970 00:00:00 GMT], Pragma=[no-cache], Set-Cookie=[PF=0Y4MXyDHT1TuusGW2WeQRE;Path=/;Secure;HttpOnly], transfer-encoding=[chunked], X-Frame-Options=[SAMEORIGIN]}n  | Payload: {"error":"unsupported_grant_type"}
n  | n  | --------------------------------------
21:17:16,024 | INFO  | tp1697624927-211 | LogTransaction                   | 711 - PingIdentityManager.1.0.0 - 1.0.0 | service=OnlineItineraryService path=null method=null overallDuration=686ms state=null
21:17:16,027 | INFO  | tp1697624927-211 | LoggingOutInterceptor            | 74 - org.apache.cxf.cxf-core - 3.0.4.redhat-621084 | Outbound Messagen  | ---------------------------n  | ID: 3n  | Response-Code: 200n  | Content-Type: application/jsonn  | Headers: {Content-Type=[application/json], Date=[Mon, 05 Jun 2017 02:17:16 GMT]}n  | Payload: {"error":"unsupported_grant_type"}
n  | n  | --------------------------------------