I also think there should be only one accidental in this place. As a
workaround, you can set the accidental style to modern for this note:
> \version "2.18.2"
>
> \score {
> \context ChoirStaff <<
> \accidentalStyle ChoirStaff.modern-voice-cautionary
> <<
> \relative c'' { cis4 c
Hello,
in the example below two voices have the same c'', but there is a
cancellation in one voice and cautionary cancellation in another.
Not that I have reduced font size for cautionary accidentals too much,
just for the sake of demonstration (however it should be reduced
accordingly to our loc
