In SAP Note, it is provided
<i>Q. What should my web service return to the adapter for asynchronous calls?
A: Currently, the receiver adapter expects an HTTP 200 with a SOAP envelope with an empty content for successful delivery. Any other response will result in a XI system error and triggers retries of the message.</i>
Instead of envelope with empty content, if i want an element, say, : <Result>The Result</Result>, then do i need to add only the response message, or any other modification is also required?