96 STAT. 934
PUBLIC LAW 97-258—SEPT. 13, 1982 orders under this section for goods and services that an agency or unit filling the order may be able to provide or procure by contract. (c) Payment shall be made promptly by check on the written request of the agency or unit filling the order. Payment may be in advance or on providing the goods or services ordered and shall be for any part of the estimated or actual cost as determined by the agency or unit filling the order. A bill submitted or a request for payment is not subject to audit or certification in advance of payment. Proper adjustment of amounts paid in advance shall be made as agreed to by the heads of the agencies or units on the basis of the actual cost of goods or services provided. (d) An order placed or agreement made under this section obligates an appropriation of the ordering agency or unit. The amount obligated is deobligated to the extent that the agency or unit filling the order has not incurred obligations, before the end of the period of availability of the appropriation, in— (1) providing goods or services; or (2) making an authorized contract with another person to provide the requested goods or services. (e) This section does not— (1) authorize orders to be placed for goods or services to be provided by convict labor; or (2) affect other laws about working funds. § 1536. Crediting payments from purchases between executive agencies (a) An advance payment made on an order under section 1535 of this title is credited to a special working fund that the Secretary of the Treasury considers necessary to be established. Except as provided in this section, any other payment is credited to the appropriation or fund against which charges were made to fill the order. (b) An amount paid under section 1535 of this title may be expended in providing goods or services or for a purpose specified for the appropriation or fund credited. Where goods are provided from stocks on hand, the Eunount received in payment is credited so as to be available to replace the goods unless— (1) another law authorizes the amount to be credited to some other appropriation or fund; or (2) the head of the executive agency filling the order decides that replacement is not necessary, in which case, the amount received is deposited in the Treasury as miscellaneous receipts. (c) This section does not affect other laws about working funds. § 1537. Services between the United States Government and the District of Columbia government (a) To prevent duplication and to promote efficiency and economy, an officer or employee of— (1) the United States Government may provide services to the District of Columbia government; and (2) the District of Columbia government may provide services to the United States Government. (b)(1) Services under this section shall be provided under an agreement— (A) negotiated by officers and employees of the two governments; and
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