Methods must be related to one of the other interfaces of the class to control ownership. Do not put these methods on the ISPFOwnedObj interface otherwise they will be displayed on all owned objects. These commands are described in more detail in Security Model.
Document ownership
Revisable documents are comprised of the document master, revision, and version.
The Check Out method is configured on the ISPFNonPublishedDocVersion to grant ownership temporarily to the user and transfers attached files to their PC for editing or updating, until the user checks the files back in again.
Owning Group ownership is controlled by the DocChangeOwnership method related to the ISPFNonPublishedDocMaster and ISPFNonPublishedDocRevison.
Object ownership
Relate the ChangeOwnerOwningGroup method to an interface on the class to manage ownership.