99. Who may give evidence of agreement varying term of document.

Person who are not parties to document, or their representatives in interest may give evidence of any fact tending to show a contemporaneous agreement varying the terms of the document.

Illustration-
A and B make a contract in writing that B shall sell certain cotton, to be paid for on delivery. At the same time they made an oral agreement that “three months” credit shall be given to A.
This could not be shown as between A and B, but it might be shown by C if it affected by his interests.

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