Final written expression -- parol or extrinsic evidence

30-2-202 . 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 record 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 ( 30-1-205 ) or by course of performance ( 30-2-208 ); 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.