The IFNA function returns the specified value if an expression results in the #N/A error; otherwise, it returns the result of that expression.
IFNA(value, value_if_na)
Returns either the result of the value or value_if_na if the #N/A error occurs.
IFNA((Actuals - Plan) / Plan, 0)
Returns (Actuals - Plan) / Plan if the expression evaluates successfully; otherwise, returns 0 if the #N/A error occurs.
