When disallowing a travel claim, the agency must:

1. (a) Pay the undisputed portion of the travel claim;
2. (b) Provide the employee with a detailed explanation for the claim's disallowance; and

3. (c) Inform the employee:

   1. (1) How to appeal the disallowance;
   2. (2) About the agency's appeal process; and
   3. (3) Of the schedule for deciding the appeal.