What is mns2 payment terms?

From a GM related company...

"The payment date is set forth in the

Line Item Detail of this contract, or if not stated, shall be the date established by Buyer's Multilateral Netting System

(MNS-2), which provides, on average, that payment shall be made on the second day of the second month

following, in the case of the Buyer's North American facilities, Seller's shipment date of goods or date of services,

and, for all of Buyer's other locations, Buyer's receipt date of the goods or date of services."