SS$_NORMAL         Normal successful completion.
    CONV$_BADLOGIC     Internal logic error detected.
    CONV$_INSVIRMEM    Insufficient virtual memory.
    CONV$_INVBKT       Invalid bucket at VBN n.
    CONV$_NOTIDX       File is not an indexed file.
    CONV$_NOWILD       No wildcard permitted.
    CONV$_OPENIN       Error opening file specification as input.
    CONV$_PLV          Unsupported prolog version.
    CONV$_PROERR       Error reading prolog.
    CONV$_PROL_WRT     Prolog write error.
    CONV$_READERR      Error reading file specification.
    CONV$_WRITEERR     Error writing output file.