overlay unique - multiple suffixes

[Andreas Schoe <andi@gfz-potsdam.de>]

Hello,

I have two suffixes with two bdb backends, in the first suffix you find 
internal and in the second suffix you find external users.
Is there a solution that every uid of each person is unique in both 
trees together?

In slapd.conf.5 it is described, that every subtree needs a directive to 
use overlay unique ".. to enforce the uniqueness of some or all 
attributes within a subtree.".

I'm running openldap version 2.3.41.

Best regards
Andreas