Enabling Edition Based Redefinition failed with ora-33819. Could I query why?
You can query something like this:

select o.owner, o.object_name, o.object_type, edition_name, editionable from dba_dependencies d, dba_objects o 
where o.owner = d.referenced_owner
and o.object_name = d.referenced_name
and d.owner = 'USER'
and o.editionable = 'Y'
and o.edition_name is NULL;


This is will list the objects referenced by user 'USER', that are editionable but dont have any editions - thus preventing you from enabling EBR for 'USER'.