Tried to merge http://ngs.musicbrainz.org/release/7836da8c-3289-4d86-a300-b85f3704b428 onto http://ngs.musicbrainz.org/release/9e3803aa-6b65-4d9c-a629-b358db9d0c9f

Selected the latter as the target, changed the new position of the bonus disc to "2."

When I click "enter edit" it gives this error:
"This merge strategy is not applicable to the releases you have selected."