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LBR Routines, LBR$DELETE_KEY, Condition Values Returned
 *Conan The Librarian 

    LBR$_ILLCTL        Specified library control index not valid.
    LBR$_KEYNOTFND     Specified key not found.
    LBR$_LIBNOTOPN     Specified library not open.
    LBR$_UPDIRTRAV     Specified index update not valid in a user-
                       supplied routine specified in LBR$SEARCH or
                       LBR$GET_INDEX.
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