20-9-207. Documentation of expenditures. (1) The expenditure of district money, other than employee contract payments, may be authorized by the trustees when:

(a) payee-signed claims, in which the payee attests to the accuracy of the claim and that the payee has not received the claimed amount, have been issued to the district; or

(b) the payee has provided the district with an invoice or other document identifying the quantity and total cost per item included on the invoice.

(2) The intention of this section is to provide sufficient documentation for each expenditure of district money.