PAROL OR EXTRINSIC EVIDENCE

(1) Terms with respect to which the confirmatory records 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 supplemented by evidence of:

(a) course of performance, course of dealing, or usage of trade (Section 1-303); and

(b) consistent additional terms unless the court finds the record to have been intended also as a complete and exclusive statement of the terms of the agreement .

(2) Terms in a record may be explained by evidence of course of performance, course of dealing, or usage of trade without a preliminary determination by the court that the language used is ambiguous.