The CISG is a set of rules that governs the rights of sellers and buyers that engage in contracts involving the international sale of goods. In this webinar, attorney and licensed customs broker Jack Shelton explains the fundamentals of a sales contract including why you need a written contract.The contracting officer shall insert the clause at 52.229-2, North Carolina State and Local Sales and Use Tax, in solicitations and contracts for construction. Current Statewide Term Contracts can be found on this page. "Contract for sale" includes both a present sale of goods and a contract to sell goods at a future time. The United Nations Convention on Contracts for the International Sale of Goods (CISG) is the law governing crossborder sale of goods transactions. The contracting officer shall insert the clause at 52.229-2, North Carolina State and Local Sales and Use Tax, in solicitations and contracts for construction. What are the important differences between domestic sales contract law and the rules set out in the CISG? 1. The U.S. perspective. North Carolina Nat'l.