Absence - Restrict future termed employee to overbook Absence

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We had a situation recently where an employee with a future term date, was able to book PTO in Absence Management which exceeded his accrued PTO entitlement. 

• Employee was terminated in Fusion application HCM on 10th July with a future term date of 1st August.
• HR checked his accrued PTO entitlement up to his term date and advised the employee of his PTO balance.
• Employee subsequently booked PTO in Absence Management which exceeded his PTO balance as of term date resulting in an overpayment.

 Is there a way to prevent this from happening in future?

Kind regards