...
The default types for any Extended Type can be restored by selecting the appropriate Extended Type and clicking Add/Restore Default Types. Any existing non-default types will remain.
As of Registry v4.1.0, Org Identities support Extended Types. Within a CO, CO Person and Org Identity attributes share the same set of available types. Org Identity Affiliation will use the same options as CO Person Role Affiliation.
eduPersonAffiliation and Extended Affiliations
...