basedn is unable to see OUs

[Hugo Monteiro <hmmm@fct.unl.pt>]

	I have succesfully build the basedn, the OUs and all the entries, but
my basedn can't see his OUs.
	my slapd.conf is:
--
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include		/etc/ldap/slapd.at.conf
include		/etc/ldap/slapd.oc.conf
schemacheck	off
#referral	ldap://root.openldap.org/

pidfile		/usr/local/var/slapd.pid
argsfile	/usr/local/var/slapd.args

#######################################################################
# ldbm database definitions
#######################################################################

database ldbm
suffix "ou=Internal, o=Faculdade de Ciências e Tecnologia, c=PT"
rootdn "cn=Directory Manager, o=Faculdade de Ciências e Tecnologia,
c=PT"
rootpw secret
directory /usr/local/ldap/phonebook/internal

database ldbm
suffix "ou=People, o=Faculdade de Ciências e Tecnologia, c=PT"
rootdn "cn=Directory Manager, o=Faculdade de Ciências e Tecnologia,
c=PT"
rootpw secret
directory /usr/local/ldap/phonebook/people

database ldbm
suffix "ou=Alunos, o=Faculdade de Ciências e Tecnologia, c=PT"
rootdn "cn=Directory Manager, o=Faculdade de Ciências e Tecnologia,
c=PT"
rootpw secret
directory /usr/local/ldap/phonebook/alunos

#database ldbm
#suffix "o=Faculdade de Ciências e Tecnologia, c=PT"
#rootdn "cn=Directory Manager, o=Faculdade de Ciências e Tecnologia,
c=PT"
#rootpw secret
#directory /usr/local/ldap/phonebook

database ldbm
suffix "o=Faculdade de Ciências e Tecnologia, c=PT"
rootdn "cn=Directory Manager, o=Faculdade de Ciências e Tecnologia,
c=PT"
rootpw secret
directory /usr/local/ldap/phonebook
--

one of my OUs entries is:

--
dn: ou=Alunos, o=Faculdade de Ciências e Tecnologia, c=PT
objectclass: top
objectclass: organizationalUnit
cn: Alunos
ou: Alunos
--

Does this entry have to have some other attribute so it can be binded to
the basedn?

Thanks in advance,
Hugo.

-- 
---------------------------------------------------------------------------
| Hugo Monteiro                      | Móvel: +351-966 386
090            |
| Serviço de Informática da          | Fixo : +351-212 948 300 Ext.1
0703 |
| Faculdade de Ciências e Tecnologia |                             1
5306 |
| Universidade Nova de Lisboa       
|                                    |
| 2825-114 Monte Caparica            | Email:
hmmm@fct.unl.pt             |
---------------------------------------------------------------------------