Why do I see status code “400: Session is invalid” during eRoamingAuthorizeStop (CPO) or eRoamingAuthoriszeRemoteStop (EMP) test?

There are two reasons for this:

1. Session ID is invalid. The Session ID is unknown because it is not generated by the HBS system. Please send a stop request with a valid session ID.
2. The session was already closed by a CDR by the CPO, e.g. because the charging process was terminated by unplugging the cable. Please use a valid session ID.