OK, then it sounds like the soap wrapper service you created (you did create one, right?) is not returning a soapResponseData object containing a valid soap message.
Your wrapper service accepts a soapRequestData object, extracts the body, convertst the body to a document, invokes your “wrapped” service and then converts the results of that service into a soap document.
If you miss any of those steps, you can’t invoke your Flow or Java service with a document/literal soap message.
See the sticky post in this forum for document / literal steps and example.
Mark
#soa#webMethods#API-Management