Absence carryover limit

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Hi,

We are using Accrual Matrix with fast formula for carryover limit, now we want to change carryover limit from 3 to 4 days from 1/1/2020 on wards , how to do this please ? do we need to update the record from 1/1/2020 or just end dating the accrual matrix and creating the new matrix effective from 1/1/2020 ?

Thanks