The travel accounting system must:

1. (a) Authorize the methods of payment outlined in the agency's internal policy in accordance with part 301-51 of this chapter;
2. (b) Correlate travel data accumulated by the agency's authorization and claims accounting systems with common carrier transportation documents and data for audit purposes;
3. (c) Identify unused tickets for refund;
4. (d) Collect unused, partially used, or downgraded/exchanged tickets, from travelers upon completion of travel;
5. (e) Track denied boarding compensation from employees;
6. (f) Identify and collect refunds due from carriers for overpayments, or unused, partially used, or downgraded/exchanged tickets; and
7. (g) Reconcile all centrally billed travel expenses (e.g., airline, lodging, car rentals, etc.) with travel authorizations and claims to assure that only authorized charges are paid.