Help on ACL

Dear list-members,

I want to grant write access to users to a kind of personal addressbook.

User-DNs are for example: uid=user@example.com,ou=example.com,ou=virtualmail,dc=my,dc=company

The personal Addressbook is stored under ou=user@example.com,ou=addressbook,dc=my,dc=company

and an entry in the addressbook looks: uid=someuniqeid@mail.my.company,ou=user@example.com,dc=addressbook,dc=my,dc=company

so far I didn't have success with constructing an ACL, which grants write access.

I've tried modifying the example found in http://www.horde.org/apps/turba/docs/LDAP (in fact that's the application, which the addressbook is for), but no success so far (but a lot of "no such object"-entries in the log).

Any help appreciated

Regards Hanns