If a sales contract prohibits any changes unless they are in a signed writing, then only those changes agreed to in a signed writing are enforceable.

Question

Quizplus · Accepted Answer

This statement reflects the principle of the "parol evidence rule," which generally prohibits the introduction of evidence outside the written contract that would alter or contradict its terms, especially when the contract explicitly states that all changes must be in writing and signed by the parties.

If a Sales Contract Prohibits Any Changes Unless They Are