Final Written Expression: Parol or Extrinsic Evidence
Section 2-202. 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
[ Clause (a) effective until July 1, 2013. For text effective July 1, 2013, see below.]
(a) by course of dealing or usage of trade (section 1-205) or by course of performance (section 2-208); and
[ Clause (a) as amended by 2013, 30, Sec. 6 effective July 1, 2013 applicable as provided by 2013, 30, Sec. 116. For text effective until July 1, 2013, see above.]
(a) by course of performance, course of dealing or usage of trade, in section 1-303; and
(b) 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.