Nssov overlay in Ubuntu 12.04

Hi all, I'm trying to setup the nssov overlay in Ubuntu 12.04. I setup the server as the official doc suggested here: https://help.ubuntu.com/12.04/serverguide/openldap-server.html Now I'm stuck because I didn't find anywhere a working ldif example to enable the addon. I tried with the following ldif:

dn: olcOverlay={0}nssov,olcDatabase={1}hdb,cn=config objectClass: olcOverlayConfig objectClass: olcNssOvConfig olcOverlay: {0}nssov olcNssSsd: test ldap:///ou=People,dc=example,dc=com

but I get: ldap_add: Invalid syntax (21) additional info: objectClass: value #1 invalid per syntax

Can someone please give some advice?

Thank you!

Simone Scremin