Okla. Stat. tit. 12A, § 2-323
(2) Where in a case within subsection (1) a tangible bill of lading has been issued in a set of parts, unless otherwise agreed if the documents are not to be sent from abroad the buyer may demand tender of the full set; otherwise only one part of the bill of lading need be tendered. Even if the agreement expressly requires a full set.
(3) A shipment by water or by air or a contract contemplating such shipment is "overseas" insofar as by usage of trade or agreement it is subject to the commercial, financing or shipping practices characteristic of international deep water commerce.
Oklahoma Code Comment In some domestic shipments, and in most foreign shipments, bills of lading are issued in sets, usually of four. All parts of the set cover the complete shipment, and are original bills. Parts of the set travel with the goods, and the other parts are sent by other means of transportation. This is done so that there will be evidence of the shipment available in the event of casualty to other parts. The presence of several original bills, however, creates the problem of bona fide purchasers of parts, which is governed by Article 5 of the Commercial Code. The problem of presenting the bills for payment is governed in this section.
Laws 1961, SB 36, p. 84, §