Is evidence of an oral agreement not admissible to alter the terms of a written agreement?

Saskatchewan, Canada


The following excerpt is from Harvest Holdings Ltd. v. Bohun and Carpendale, 1984 CanLII 2475 (SK QB):

It is settled law that evidence of an oral agreement is not admissible to alter the terms of a written agreement unless the oral agreement is collateral to the written agreement and its terms do not contradict and are not inconsistent with the terms of the written agreement. Hawrish v. Bank of Montreal (1969), 1969 CanLII 2 (SCC), 66 W.W.R.(N.S.) 673.

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