SOAP FAULT error in HCI PI Integration

Dear Experts-

I am working on a proxy to SOAP scenario in HCI PI. I am using service interface from existing interface in PI. I have created a scenario by using request-reply step. I have completed all the SOAMANGER configuration for outbound proxy and it is all in place. In PI landscape under service a interface there was fault message which had removed as operation mapping can't be done in HCI PI. I have re-generated the proxy so that fault message part is removed in ECC. When trigger the program am getting following error.

" Inbound processing in endpoint at /DFA_PcMiler failed with message "Fault:Message part {http://dfa.com/OTC/PCMiler}ECC_PCMiler_Req was not recognized. (Does it exist in service WSDL?)" I don't have fault message either in ECC or HCI and I am not sure where am getting this error message. I have done common trouble shooting methods. Please let me know if any taught or ideas to fix this issue. Please find my integration scenario below.