Attendance Plans - Negative taken & carryover at YE close

SUGGESTED

We have a couple of attendance plans that accrue a specified amount by year end. There are instances when we need to add time to an individuals plan & we do this by creating a negative usage transaction. If they haven't used enough to counteract that by year end - it can lead to a negative amount entered in the "Taken" at the time of closing the current year and opening a new one. I'm wondering how this could impact the carryover. Will it cause an issue or does carryover get calculated by the system using the amount reflected in the "Available" column? Just trying to be proactive and end up having to do a bunch of manual fixes come 2021.