SS$_NORMAL         Normal successful completion.
    SOR$_BADLOGIC      Internal logic error detected.
    SOR$_BAD_KEY       Invalid key specification.
    SOR$_BAD_LRL       Record length n greater than specified longest
                       record length.
    SOR$_BAD_MERGE     Number of work files must be between 0 and 10.
                       (For the high-performance Sort/Merge utility,
                       the maximum number is 255.)
    SOR$_BAD_TYPE      Invalid sort process specified.
    SOR$_ENDDIAGS      Completed with diagnostics.
    SOR$_INSVIRMEM     Insufficient virtual memory.
    SOR$_KEYAMBINC     Key specification is ambiguous or
                       inconsistent.
    SOR$_KEY_LEN       Invalid key length, key number n, length n.
    SOR$_LRL_MISS      Longest record length must be specified.
    SOR$_NODUPEXC      Equal-key routine and no-duplicates option
                       cannot both be specified.
    SOR$_NUM_KEY       Too many keys specified.
    SOR$_NYI           Not yet implemented.
    SOR$_RTNERROR      Unexpected error status from user-written
                       routine.
    SOR$_SORT_ON       Sort or merge routine called in incorrect
                       order.
    SOR$_STABLEEXC     Equal-key routine and stable option cannot
                       both be specified.
    SOR$_SYSERROR      System service error.
    SOR$_UNDOPTION     Undefined option flag was set.