Hi, to allow writing I added the following in the /etc/ldap/slapd.conf file:
access to dn.sub="dc=dom,dc=lan" filter="(&(objectClass=posixGroup)(objectClass=univentionGroup)(!(|(cn=Domain Admins)(cn=Groups Admin)(cn=Administrators))))" attrs="uniqueMember,memberUid"
by set="user & [cn=Groups Admin,cn=groups,dc=dom,dc=lan]/uniqueMember*" write
by * break
now I have to make sure that the changes are not lost when the file is updated from the templates.