It might be better to use one of those as the accepted value, and emit an error message if the other doesn't comply.
I have added code to display a warning if the number of ranks calculated from the FEN Code does not match the number calculated from the value of the Rank Labels field. Perhaps because of the CSS for the warning class, it is showing up even though it's where messages are normally hidden.
I have added code to display a warning if the number of ranks calculated from the FEN Code does not match the number calculated from the value of the Rank Labels field. Perhaps because of the CSS for the warning class, it is showing up even though it's where messages are normally hidden.