The original manuscript appeared to lack a finale.
[1] Ludwig Scheibler (1848-1921) was the first to suggest in 1905 that the Rondo in E, D.506 might be that movement.
[2] The British composer and musicologist Kathleen Dale produced the first edition using this suggestion in 1948.
[3] The 1976 Henle edition by Paul Badura-Skoda followed the same practice.
Scherzo: Allegro vivace - Trio (IV.