[389-users] enabling posixGroup for a group (error : attribute "uidNumber" not allowed)

Hello, I am trying to get system groups working on 389-ds via the addition of "posixGroup" as a value for a given LDAP group. Numerous posts in the archives, as well as on other forums, seem to indicate that it should be a relatively straightforward affair. Here's what i've tried via the console : 1. Creation of OU "systemgroups" 2. Creation of group "admin" 3. In advanced properties of group "admin", Object Class -> Add value -> posixGroup 4. OK However, this error appears in the log : [02/Jul/2010:09:43:03 +0000] - Entry "cn=admin,ou=systemgroups,dc=domain,dc=net" -- attribute "uidNumber" not allowed I am sure i have just missed something small, like the activation of a plugin, or the integration of a particular schema. I can create users with associated posix data (uid, gid, homedir, etc...), so at least that works. :) Any help, or a push in the correct direction, would be greatly appreciated. Thank you, all. -- Daniel Maher <dma + 389users AT witbe DOT net>