For payments not exceeding 300.00 made to suppliers/ establishments not issuing OR/invoice, Certificate of Expenses Not Requiring Receipts (CENRR) is required. For payments above ₱300.00 but not exceeding ₱1,000.00 made to suppliers/ establishments not issuing OR/invoice, a Reimbursement Expense Receipt (RER) can be used in lieu of the OR/Invoice.