One of the preceding USS messages was to be issued, but VTAM® could not find the definition for this message. The value of number indicates which USS message was not located; see the description of that USS message to determine what condition occurred.

For example, an unrecognized command condition occurred, but VTAM could not locate USSMSG02 in ISTINCDT, the IBM-supplied session-level USS table. Since the IBM-supplied table defines all USS messages (except for 00 and 10), this message has been deleted. USSMSG14 is evidence that the USS tables have been has improperly defined or installed.