Section 17-301 - Definitions(a) In this subtitle the following words have the meanings indicated.(b) "Proper invoice" means an invoice that: (1) contains the contractor's federal employer's identification number or Social Security number;(2) contains the contract or purchase order number or other description of the contract; and(3) contains or is accompanied by the substantiating information and documentation required by regulation or contract.(c) "Receipt date" means the date that a proper invoice is received by the Commission.