"This is not true. Make-up vacation has nothing to do with trip length vs vacation length. It's all based on if you have or are projected to have a deficit in your vacation bank. You can put in for VMU for whatever your deficit is +6 hours in the view/add period for your vacation month. You don't even have to have vacation in the month you do it, if you're already in the hole (although those inputs can't use the view/add and are just like any other makeup request - actually they have the lowest priority of all m/u)."

I agree with that. I worded it poorly. Though I've never tried to do a view/add in a month that I didn't have vacation (but was in the hole for vacation), so I can't validate that. I actually find very little reason to ever do vacation m/u, since you're stuck with the trip.