(a) In this subtitle the following words have the meanings indicated.
(b) “Payment date” means the date of the Commission’s check.
(c) “Proper invoice” means an invoice that:
(1) contains:
(i) the contractor’s federal employer identification number or Social Security number; and
(ii) the contract or purchase order number or other description of the contract; and
(2) contains or is accompanied by substantiating information and documentation as required by regulation or contract.
(d) “Receipt date” means the date that a proper invoice is received by the Commission.