According to the evidence rule, when parties have executed a written agreement which is complete on its face, oral agreements made before or at the same time as the written agreement that vary, alter, or contradict the written agreement are invalid.

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The term for this rule is the parol evidence rule. It is a common law rule that prevents parties from introducing oral statements or agreements that contradict, modify, or vary the terms of a written agreement that has been fully integrated into the contract.

According to the Evidence Rule, When Parties Have Executed a Written