Mississippi Code Title 31. Public Business, Bonds and Obligations § 31-7-303

(1) The requisition for payment of an invoice submitted to a public body and required by law to be filed with the State Fiscal Management Board shall be filed with the State Fiscal Management Board not later than thirty (30) days after receipt of the invoice and receipt, inspection and approval of the goods or services, except that in the case of a bona fide dispute the requisition for payment shall contain a statement of the dispute and authorize payment only in the amount not disputed. If a requisition for payment filed within the thirty-day period is returned by the State Fiscal Management Board because of an error, it shall nevertheless be deemed timely filed. The thirty-day filing requirement may be waived by the State Fiscal Management Board on a showing of exceptional circumstances in accordance with rules and regulations established by the State Fiscal Management Board.

(2) The warrant, in payment of an invoice submitted to a public body of the state, shall be mailed or otherwise delivered by the public body not later than fifteen (15) days after filing of the requisition for payment; however, this requirement may be waived by the State Fiscal Management Board on a showing of exceptional circumstances in accordance with rules and regulations of the State Fiscal Management Board or as otherwise provided in Section 7-7-35, Mississippi Code of 1972.