The parol evidence rule applies to the sale of goods, with the slight modification that a writing is not presumed to represent the entire contract of the parties unless the court specifically decides that it does. If the court so decides, parol evidence is not admissible to add to or contradict the terms of the writing. If the court decides that the writing was not intended to represent the entire contract, the writing may be supplemented by proof of additional terms, as long as these terms are not inconsistent with the written terms.