Cash Advances - Refund of unused cash adavnce

Summary

Refund of unused cash advance

Content

Hi,

Employee requests cash advance $500.

Submits expenses worth of $350. Cash advance gets applied to the payment request in AP.

$150 still available for any future expense. 

Employee has no further travel or left the company. (actual reimbursement can be done several ways, employee giving cheque, or deduct from final payroll).

How to close the loop in AP for that $150.

Any ideas would be appreciated.

Thanks

Ravi