I think you mean MTEC (Minor Travel Expense Claim) which I believe doesn't exist any more. We're doing all of ours on a CF 52 General Allowance Claim. Receipts are required (credit card slips are not sufficient, it needs to be the itemized receipt).
Your substantiation in this instance is:
CFTDI 5.01.b and CFTDI 5.18.2.f