Multiple uses of same overlay

[Hallvard B Furuseth <h.b.furuseth@usit.uio.no>]

Can I use 2 "unique" overlays (with different base and attrs) in one
database?  over_db_config() warns that the freshly added overlay already
is in the list, and a note at that warning in backover.c says:

    NOTE: if the overlay already exists, there is no way to merge the
    results of the configuration that may have occurred during
    bi_db_config(); we just issue a warning, and the administrator
    should deal with this

What does that mean I must do in practice?

-- 
Hallvard