GPO is displayed as inaccessible in GPMC
This is normal for a GPO that is linked to the Domain Controllers container. A link to a non existing GPO on the file system should exist, but only for the Domain Controllers container.
If a container other than Domain Controllers has the gplink attribute populated, but no corresponding GPO exists in the /var/opt/novell/xad/sysvol/domain/Policies, delete the value in the gplink attribute. Look for an object with the same name in CN=Policies,CN=System,<Mapped Domain Container> and delete the object if it exists. Create a new GPO if desired.
The gplink attribute on the domain controllers container is pointing to a non existing GPO on the filesystem.
dn: ou=Domain Controllers,o=novell