Notwithstanding any other provision of law, any funds appropriated pursuant to section 13 of this title, for any fiscal year which are not obligated or expended prior to the beginning of the fiscal year succeeding the fiscal year for which such funds were appropriated shall remain available for obligation or expenditures during such succeeding fiscal year. In the case of amounts made available to a tribal organization under a self-determination contract, if the funds are to be expended in the succeeding fiscal year for the purpose for which they were originally appropriated, contracted or granted, or for which they are authorized to be used pursuant to the provisions of section 450j-1(a)(3) (!1) of this title, no additional justification or documentation of such purposes need be provided by the tribal organization to the Secretary as a condition of receiving or expending such funds.