Documentum Content Server version 6.6 introduced a new feature, “Owner Minimum Permissions”, which allows the minimum permissions for owners to be set across the repository. These permissions would override any ACL based calculations – no ACL could reduce the effective owner permissions to be more restrictive than the ones set up in this configuration. Note that version 5.3 also has a similar behavior except that the owner minimum permissions are fixed (not configurable) – READ and all extended permissions other than EXTENDED DELETE.
It has been confirmed that this feature does not work as expected in version 6.6. At least for one operating system and database combination, these settings have no effect and the behavior is identical to 5.3. It is quite likely that this problem is not restricted to this one environment configuration.