subtree-exclude (was Re: slapd-meta exclude syntax; larger problem with

Hi folks -

first, a simple, direct question. I'm trying to use the meta backend, and exclude part of the
back-end directory (which is AD, if that matters).

I tried the following config:

--------------------------
include     /usr/local/pkg/openldap-2.4.39/etc/openldap/schema/core.schema
include     /usr/local/pkg/openldap-2.4.39/etc/openldap/schema/cosine.schema
include     /usr/local/pkg/openldap-2.4.39/etc/openldap/schema/inetorgperson.schema
include     /usr/local/pkg/openldap-2.4.39/etc/openldap/schema/nis.schema

pidfile     /var/run/openldap/slapd-filter.pid
argsfile    /var/run/openldap/slapd-filter.args

loglevel    any

access to *
        by *    read

database    meta
suffix      "dc=adsroot,dc=itd,dc=umich,dc=edu"
uri         "ldap://adsroot.itd.umich.edu/dc=adsroot,dc=itd,dc=umich,dc=edu"
rootdn      "cn=Manager,dc=adsroot,dc=itd,dc=umich,dc=edu"

#subtree-exclude      "ou=ICPSR,ou=Organizations,ou=UMICH,dc=adsroot,dc=itd,dc=umich,dc=edu"
#subtree-exclude      "ou=ICPSR,ou=Accounts,ou=UMICH,dc=adsroot,dc=itd,dc=umich,dc=edu"
subtree-exclude      "dn.subtree:ou=ICPSR,ou=Organizations,ou=UMICH,dc=adsroot,dc=itd,dc=umich,dc=edu"
subtree-exclude      "dn.subtree:ou=ICPSR,ou=Accounts,ou=UMICH,dc=adsroot,dc=itd,dc=umich,dc=edu"
--------------------------

As you can see i tried two syntaxes for subtree-exclude. with either one, a search for "cn=danno" returns
dn: cn=danno,ou=ICPSR,ou=Accounts,ou=UMICH,dc=adsroot,dc=itd,dc=umich,dc=edu

What am I doing wrong? Or do I misunderstand what subtree-exclude is supposed to be doing?

openldap 2.4.39 on centos 6, x64.

subtree-exclude (was Re: slapd-meta exclude syntax; larger problem with rwm, collective attributes.)