§18–501.

    (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.