Is there a way to show a custom error message for an invalid column?
I’m guessing you mean for a data validation error. No. One thing you could do is provide input guidance in the column description. Eg: column name: Price, column description: enter a value between $1 and $99
You can always add a Show column right after the column in question, where you can display a message if the value entered is invalid. I do this several places in my app. Set the value for the content to show, and set ShowIf accordingly. Then use a format rule to display the content in red and bold - never fails to draw people’s attention :=)
Thanks for the suggestion.