Gotta love it. 25.L.11 says moving R days will not be unreasonably denied....and you can drop R days as long as the forecast permits (25.L.2.b "the Reserve Forecast modeling system" to be precise)

But, no real definition out there and the company often seems to think it's unreasonable that you would even think of moving an R day.....let alone dropping one.

Even though there might be no open trips and MaxOpen is a huge number.