§490:2A-202  Final written expression: 
parol or extrinsic evidence.  Terms with respect to which the confirmatory
memoranda of the parties agree or which are otherwise set forth in a writing
intended by the parties as a final expression of their agreement with respect
to such terms as are included therein may not be contradicted by evidence of
any prior agreement or of a contemporaneous oral agreement but may be explained
or supplemented:



(1)  By course of dealing or usage of trade or by
course of performance; and



(2)  By evidence of consistent additional terms unless
the court finds the writing to have been intended also as a complete and
exclusive statement of the terms of the agreement. [L 1991, c 40, pt of §1]