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_SESRET defined as travel over 50 miles. The invoice shall include the period of performance covered by the invoice, the CLIN number and title. G.3.1 CLIN/Task Total Travel This will identify all current and past travel on the project and the total CLIN/Task costs billed. The listing shall include separate columns and totals for the current invoice period and the project to date: Travel Authorization Request identifier, approver name, and approval date Current invoice period Names of persons traveling Number of travel days Dates of travel Number of days per diem charged Per diem rate used Total per diem charged Transportation costs (rental car, air fare, etc.} Total charges Explanation of variances exceeding 10% of the approved versus actual costs AP-37 Page 11 of 54