§12A-1-103.

§12A-1-103.
   
   Unless displaced by the particular provisions of this act, the
   principles of law and equity, including the law merchant and the law
   relative to capacity to contract, principal and agent, estoppel,
   fraud, misrepresentation, duress, coercion, mistake, bankruptcy, or
   other validating or invalidating cause shall supplement its
   provisions.