Future payments
I feel that when checking out guests in mews, it can get confusing when a guest has a "future payment" leading to many awkward moments when you tell the guest that there seems to be something they need to pay, only to realise after that it's a future payment and you now took more of their time which also worries guests a bit on if they have paid or not, I think having the current check-in and future payments separated as a standard and not displayed as "Something left to pay" would be ideal, if someone wants to pay for their future visits too it wouldn't be hard to just mash them together, but ususally it's the opposite from what I've personally seen.
Of course, just an idea though! Thanks! ^o^