To keep track of inventory available, they have to assign a reservation to either dedicated or lockoff. They need to know how many lockoffs have been reserved as 2 bedrooms and how many are available to split up between a studio & 1 bedroom to two different reservations. From what I've heard, they book the dedicateds first, leaving lockoffs available to go either way. On the other hand, they may make some last minute switches, which may not make it totally guaranteed.