§214 Evidence of Prior or Contemporaneous Agreements and Negotations
Agreements and negotiations prior to or contemporaneous with the adoption of a writing are admissible in evidence to establish:
(a) that the writing is or is not an integrated agreement
(b) that the integrated agreement, if any, is completely or partially integrated
(c) the meaning of the writing, whether or not integrated
(d) illegality, fraud, duress, mistake, lack of consideration, or other invalidating cause
(e) ground for granting or denying rescission, reformation, specific performance, or other remedy.