VMS Help CC, Messages, INVDUPENUM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the value of the enumerator "<name>"
                conflicts with a previous declaration.

 Description    The specified enumerator name has been previously
                declared with a different value.

 User Action    Either use a different enumerator name or remove the
                previous declaration of the name.