If you want to use a logical (boolean) parameter of the type YES/NO in a Revit schedule so that it displays as a text or symbol - i.e. to show "YES" or "NO" or an adequate graphic symbol (e.g. a checkmark or a tick) in the schedule, you will need to create a calculated column with an expression.
First add the given logical parameter to your schedule and then add one more column, wher you will use the expression. This expression will convert the parameter value to a text or a symbol available in the font you are using (e.g. in Arial Unicode you can use the "Ballot box" from the Character Map). Examples:
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Please use these tips at your own risk. Arkance Systems is not responsible for possible problems that may occur as a result of using any of these tips.