I would like to request the solo horn part (if possible, also the piano reduction score) of the piece in title. I know the piece is not well known, but there is actually such a piece (I just found out today...).
The only edition I know of is from Hans Pizka (Munich 1979). <pure_speculation>I'm betting he typeset it from a manuscript (or from fragments) and I don't seem him ever giving it up. If that's the case it won't be public domain for quite some time (unless the 25 year german scientific edition law applies).</pure_speculation> If you know of another edition let us know. If you know more of the history behind the piece let us know too.