U.S. Customs authorities receive this transaction set from exporters, freight forwarders, and customs brokers to report detailed information about shipments being exported from the United States. The 601 serves as a formal declaration to customs containing essential export details required for regulatory compliance and clearance. Key segments include the BA1 (Export Shipment Identifying Information) which establishes the core shipment record, the DTM (Date/Time Reference) for temporal tracking, and the P5 (Port Information) segment specifying the departure port, with supporting segments like YNQ (Yes/No Question) for customs questionnaires and L13 (Commodity Details) for itemized cargo descriptions.

Consider a pharmaceutical exporter, Meridian Health Products, shipping a containerized shipment of over-the-counter medications to a Canadian distributor through the Port of Oakland. Meridian’s customs broker, Global Trade Solutions, prepares and transmits the 601 transaction set to U.S. Customs and Border Protection. The transmission includes a BA1 record identifying the shipment, DTM segments marking the export date and vessel departure time, P5 data specifying Oakland as the port of export, N1 loops identifying Meridian as the exporter and the Canadian distributor as the consignee, and L13 commodity segments itemizing each medication SKU with quantity and harmonized tariff codes. Customs validates the declaration against prior filings and either grants clearance or requests additional documentation via the YNQ responses.