Original: For orchestration of piano music, some theorists recommend transposing the music to F major or G major. If F-sharp major must absolutely be used, one should take care that B-flat wind instruments be notated in A-flat major, rather than G-sharp major.
Simplified: If F-sharp major needs to be used, transposing instruments in B flat should have their music written in A-flat major, not G-sharp major.