The disposition directions and funeral prearrangements that are contained in a funeral service contract, as defined in section 42-200, shall not be subject to cancellation or substantial revision by the person or persons with the right of disposition following the death of the decedent unless (1) any financial resources set aside to fund the funeral service contract are insufficient under the terms of the funeral service contract to carry out the disposition directions and funeral prearrangements contained in such contract, and (2) the cancellation or substantial revision of the disposition directions or funeral prearrangements contained in a funeral service contract has been approved by a Probate Court.