I am having a VERY hard time actually creating a Communication Scenario in the Studio.. it appears to be very buggy..
I can easily include my Webservices.. However some of the SAP ones throw exceptions and State they are not in the PSM (where is the list of what Services are in the PSM)... so why are they Listed if we can not actually include them?...
But if you select one of these "Forbidden" services it does not tell you which one it is.. and proceeds to crash out of the wizard.. or if you are modifying an existing one.. tries to save the file locally when you save.
See image below