California Commercial Code — Sales — Form, Formation And Readjustment Of Contract — Final written expression; parol or extrinsic evidence Date: 14 Sep 2016 TEXT PDF Current through the 2016 Legislative Session 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 (a) By course of dealing, course of performance, or usage of trade (Section 1303); 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. Ca. Com. Code § 2202 Amended by Stats 2006 ch 254 (SB 1481),s 33, eff. 1/1/2007.