Who to request an advance decision when faced with a questionable payment in defense travel system?

When faced with a questionable payment in the Defense Travel System (DTS), you should request an advance decision from your Defense Finance and Accounting Service (DFAS) representative or your unit's finance office. Provide them with all relevant documentation and details regarding the payment issue. They will review the situation and provide guidance on how to proceed, ensuring compliance with regulations. It's important to initiate this process as soon as possible to avoid any potential financial discrepancies.