/sys$common/syshlp/helplib.hlb CMS, INSERT, GROUP, Restrictions  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    o  You cannot insert a group into another group that has read-only
       access.
    o  You can insert a group into another group only once.
    o  You cannot create recursive groups; that is, a group cannot
       directly or indirectly be a member of itself.
    o  You cannot insert a group from one library into a group in
       another library (both groups must be in the same library).