I'd like to join this thread with exactly the same problem as Jerome or Shah has. Our BP instance (5.0.30) is configured with SSO. I've built simplest possible process (no inputs, 2 outputs), published & exposed it. Now:
I can see WSDL via http://ResourcePC:8191/ws/ProcessName?wsdl
3rd party tools (SoapUI, Postman) are able to see it, but posting query results into an error:HTTP/1.1 401 Unauthorized
Content-Length: 0
Cache-Control: no-cache
...
I've even tried adding it back to BP as a webservice (System -> Objects -> Web Services). All outputs are recognized. Unfortunately doesn't matter what I select in step ""Please supply authentication details for this web service"", I get an error ""Internal : Unexpected error Error in web service - You are not authorised to call this webservice"" while calling it.
I've tried unticking everything, using my SSO users User/password - same.
It definitely seems like an issue with SSO, because once I had same setup on BP without SSO, it worked straight away.