To be specific while performing the recording the recorder is not able to capture any transaction, ie transaction count was not getting increased on investigating further found out that the workstation log file was showing a HTTP header error.
So point is I am only in recording phase and the transaction is not getting intercepted by DevTest and the logs indicate some sort of HTTP header error in request / response which is preventing Devtest to capture the transaction. (Real application is able to call the service is getting the proper response, even invoked the real service via SOAP UI got the response)
So this led me to ask the initial question - if there is a way during recording devtest internal code can just ingore headers and capture the transaction.