Any sale or encumbrance to the personal representative, the personal representative's spouse, agent, or attorney, or any corporation or trust in which the personal representative has a substantial beneficial interest or any transaction that is affected by a substantial conflict of interest on the part of the personal representative is voidable by any person interested in the estate except one who has consented after fair disclosure unless:
(1) the will or a contract entered into by the decedent expressly authorized the transaction; or
(2) the transaction is approved by the court after notice to interested persons.