How to resolve ex employee pending PCARD expenses?

Dear All,

We have on going process issue in our production since many months, i would like to bring it to you all to get an advise in resolving same.

We have PCARDS(Company sponsored credit cards) issued to employees, normally they submit their expenses and it gets settled with payable team. But employees leaving organization with out settling the due transactions are the cases of issue. We are not able to submit the expense on their behalf even we recovered the amount from their final settlement from HR.

Please advise us how we can resolve such issues and let us know how we can submit the expense reports on their behalf to settled the due expenses.