Answer
The cash-up tracker shows how much of the employee's annual holidays cash-up allowance remains for the entitlement year. Annual holiday cash-up is limited to no more than one week in an entitlement year.
The reliable way to reduce the tracker is to record the cash-up from Employees >> Leave >> Leave Entitlement Adjustments >> Cash Up Annual Holidays. That creates the ledger row and reduces the annual holidays balance.
Use Balance Breakdown to review the remaining cash-up weeks before processing another request. If you are migrating an employee who already cashed up leave in the current entitlement year, make sure the opening balance and any prior cash-up history are represented before approving another cash-up.