19 CFR 141.81 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 141.0 To Parts 193-199) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (Continued) (§ 141.0 To Parts 193-199) — Entry Of Merchandise (§ 141.0 To § 141.113) — Invoices (§ 141.81 To § 141.92) — Invoice for each shipment.

A commercial invoice shall be presented for each shipment of merchandise at the time the entry summary is filed, subject to the conditions set forth in these regulations. Except in the case of installment shipments provided for in § 141.82, an invoice shall not represent more than one distinct shipment of merchandise by one consignor to one consignee by one vessel or conveyance.