As a result of the review, it is now our position that if a debt obligation is renegotiated otherwise than as provided for in its original terms, the determination of whether a change in its terms is a substitution of a debt obligation for another should be made in accordance with the law of the relevant jurisdiction.
. . . [A] rescission of a debt obligation will be implied when the parties have effected such an alteration of its terms as to substitute a new obligation in its place, which is entirely inconsistent with the old, or, if not entirely inconsistent with it, inconsistent with it to an extent that goes to the very root of it.