Unless displaced by the particular provisions of K.S.A. 16a-1-101 through 16a-9-102, the uniform commercial code and the principles of law and equity, including the law relative to capacity to contract, principal and agent, estoppel, fraud, misrepresentation, duress, coercion, mistake, bankruptcy, or other validating or invalidating cause supplement its provisions.
K.S.A. 16a-1-103