§12A-3-117.

§12A-3-117.
   
                   OTHER AGREEMENTS AFFECTING INSTRUMENT
                                      
   Subject to applicable law regarding exclusion of proof of
   contemporaneous or previous agreements, the obligation of a party to
   an instrument to pay the instrument may be modified, supplemented, or
   nullified by a separate agreement of the obligor and a person entitled
   to enforce the instrument, if the instrument is issued or the
   obligation is incurred in reliance on the agreement or as part of the
   same transaction giving rise to the agreement. To the extent an
   obligation is modified, supplemented, or nullified by an agreement
   under this section, the agreement is a defense to the obligation.