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 or usage of trade or by course of performance; 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.
(Added by Stats. 1988, Ch. 1359, Sec. 5. Operative January 1, 1990, by Sec. 11 of Ch. 1359.)