/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Messages  ILLENUMVAL
 enumeration value out of legal range

    Facility: DEBUG, VMS Debugger

    Explanation: The predecessor (or successor) function has been
    used on the first (or last) component of the enumeration. The
    result would not be a valid value of the enumeration.

    User Action: Do not use the predecessor (or successor) function
    on the first (or last) component of the enumeration.
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