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Every message from the CBP Cargo Systems Messaging Service (CSMS), with a plain-English summary and Allied CHB's position. We add new messages every hour.
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CBP opens a voluntary test of electronic export manifests for truck cargo
CBP announced a voluntary two-year test of the ACE Electronic Export Manifest for truck cargo. The test checks if CBP can require truck carriers to send limited export manifest data at least 24 hours before departure from the United States. A complete export manifest then follows no later than 2 hours before arrival at the final port of export. CBP limits the test to nine truck carriers that meet the requirements in the Federal Register general notice.
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The test is voluntary and applies only to truck carriers, so importers and exporters who use Allied do not need to act. Truck carriers that want to join must apply to CBP by email and show that they meet the eligibility requirements.
CBP finalizes rule requiring electronic export manifests for rail cargo
CBP published a final rule on August 26, 2026 requiring Electronic Export Manifest (EEM) filing in ACE for rail cargo departing the U.S. to Mexico or Canada. The rule sets electronic transmission requirements, eligible filers, and submission timeframes before departure. It takes effect October 26, 2026, but CBP will not begin enforcing it until October 26, 2027.
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This rule concerns rail carriers and parties who file export manifests, not import entries that we file for clients. We do not file export manifests, so this does not change the entries we handle. Clients who also move cargo outbound by rail to Mexico or Canada should confirm with their carrier or export filer that they will be ready for ACE EEM filing before the October 2027 enforcement date.
CBP updated technical guide for truck export manifest data field
CBP announced an update to the Electronic Export Manifest (EEM) Truck Manifest Implementation Guide for the 358 Customs Consist message. The change sets the usage of field M1306 to mandatory. It applies to the ACE Exports Truck X12 358 message format used for electronic export manifests.
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This update concerns the technical format that truck carriers and their software providers use to file export manifest data in ACE. It does not change import entry filing, so it does not affect the entries we file for clients. Clients who file export manifests directly or through a service provider should confirm with their software vendor that this field update was applied.
CBP updated technical guides for electronic export truck manifest EDI messages
CBP announced updates to the Electronic Export Manifest Automated Commercial Environment implementation guides for the Exports Truck UNEDIFACT CUSCAR, CUSREP, CUSRES, PAXLST, 309, 350, and 355 messages. The changes involved technical edits such as removed codes, updated data element usage, and corrected typos in the EDI specifications. CBP directed technical questions to client representatives and policy questions to its export manifest mailbox.
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This message covered technical EDI formatting changes for truck export manifest transmissions and mainly concerns carriers and software providers that send these EDI messages to CBP. Allied files import entries and does not transmit export manifest EDI data, so this update does not change the entries we file for clients. Clients who transmit their own export manifest data should confirm with their EDI provider that these formatting updates were applied, and later CSMS messages may have changed these specifications further.
CBP updates truck export manifest and conveyance report technical specs
CBP announced technical updates to the Electronic Export Manifest Truck 309 Customs Manifest and the CUSREP Conveyance Report in ACE. Changes include marking one data element as not used, removing a cancellation code, updating language for one code, and revising descriptions for two other codes. The message was published April 22, 2026 and directs technical questions to CBP client representatives and policy questions to a CBP email address.
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This message concerns technical data formatting for truck export manifest filings, which is a carrier and export filing function. It does not affect the import entries Allied files for clients. Clients do not need to take any action.
CBP Added Three Used Vehicle HTS Codes to Export Manifest Appendix U List
CBP announced that the Electronic Export Manifest (EEM) Appendix U list was updated to include three HTS codes for used vehicles: 8705.90.0010, 8705.90.0020 and 8705.90.0080. The change affected reporting requirements for used vehicle exports under the EEM program. CBP directed technical questions to client representatives and policy questions to a CBP vehicle exports mailbox.
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This notice concerned export manifest reporting for used vehicles, not the import entries we file for clients. It does not change any customs entry, classification or duty process we handle. Clients who export used vehicles under these HTS codes should confirm current EEM reporting requirements, since later CBP messages may have updated this list further.
CBP added Hamburg port code to export manifest Schedule K reference list
CBP announced an update to the Electronic Export Manifest Appendix O, Schedule K Implementation Guide. The update added Port of Unlading Code 42876 for Hamburg. The message directed technical questions to CBP client representatives and policy questions to a CBP mailbox.
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This update concerns the codes carriers and filers use when reporting export manifest data, not the import entries Allied files. It does not require any action from our import clients. Exporters or carriers using this port code in export manifest filings should confirm with their manifest service provider that the update is reflected in their system.
CBP updated technical guides for truck export manifest EDI messages
CBP updated the Electronic Export Manifest Implementation Guides for the ACE Exports Truck UNEDIFACT CUSCAR, CUSRES, CUSREP, X12 309, and PAXLST messages. The changes added codes for Post Departure Filing and Automated Export System downtime, removed confirmation of manifest and trip reporting language, and changed wording from Final Transmission to Complete Transmission. CBP directed technical questions to client representatives and policy questions to its export manifest mailbox.
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This message set technical data formatting rules for carriers and software providers that transmit truck export manifests through ACE. It does not change import entry filing, duty rates, or documentation Allied handles for clients. Clients do not need to act, but if a client also files export manifests directly, they should confirm with their software provider that these guide updates were applied.
CBP removed six port of unlading codes from Export Manifest Schedule K
CBP announced an update to the Electronic Export Manifest Appendix O, Schedule K reference table. The update removed six port of unlading codes: 27725, 27726, 42879, 27739, 27727 and 27700. CBP directed technical questions to client representatives and policy questions to its export manifest mailbox.
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This update changed a reference code table used in export manifest filings, not entry filings we handle for importers. It does not affect the import entries Allied files. Clients do not need to act, but exporters or carriers using these old port of unlading codes should confirm with their manifest filer that the change was applied.
CBP updated Ocean Export Manifest guides for port of unlading and destination fields
CBP announced updates to the Electronic Export Manifest Ocean X12 309 and Ocean CAMIR implementation guides. The updates clarified how carriers report the first foreign port of destination and unlading, added guidance for transshipment movements, and changed the Port Information data element from mandatory to optional. The changes applied to ocean carriers filing electronic export manifests.
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This message concerned technical formatting for ocean export manifests filed by carriers, not the import entries Allied files for clients. It did not require action from importers or shippers at the time. Because this is a past technical update, clients with questions about current export manifest requirements should ask Allied to check whether later CSMS messages changed these fields.
CBP Removed Burma Country Code From Export and Import Manifest Systems
CBP announced an update to ACE CATAIR Appendix B (import) and AESTIR Appendix C (export) that removed Burma (BU) as a valid country code. Myanmar (MM) remains a valid country code. The change affects manifest filers who reference country codes for shipments involving that country.
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We noted this update to the country code tables used in import and export manifest filings. The message does not give an effective date, so later CSMS notices may have adjusted the rollout. Clients whose shipments reference Burma or Myanmar should ask us to confirm which code applies to their current entries.
CBP updated technical guide for truck export manifest acceptance messages
CBP announced updates to the Electronic Export Manifest Truck X12-355 Acceptance/Rejection Message Implementation Guide. The changes corrected a typo and reduced the maximum use counts in the REF and VEH segments to one. CBP directed technical questions to client representatives and policy questions to its export manifest mailbox.
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This update concerns the technical data format for electronic export manifests filed by truck carriers, not the import entries Allied files for clients. It does not change any import entry, classification, or duty requirement. Clients do not need to take any action.
CBP posted new truck export manifest EDI guides in February 2026
CBP announced in February 2026 that it had posted new Truck Manifest implementation guides for the ACE Electronic Export Manifest system, covering X.12 and UNEDIFACT standards. These were the first versions of these guides, not updates to earlier ones. The guides covered truck carrier cargo, crew, passenger and conveyance reporting messages.
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This message concerns technical data formats that truck carriers and their software providers use to file export manifests with CBP. It does not change entry filing requirements for the entries we handle. Clients do not need to act on this notice.
CBP made ocean export manifest seal number field optional, not required
CBP announced an update to the Electronic Export Manifest Ocean X12-350 Implementation Guide. The update changed the M7A02 Seal Number field in the Seal Number Replacement segment from mandatory to optional. CBP said the change was live in production as of the message date.
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This change concerns ocean carriers that file electronic export manifests with CBP, not the import entries Allied files. It does not affect entries, ISF filings or duty refund claims that Allied handles for clients. Clients do not need to take any action because of this notice.
CBP proposed mandatory electronic export manifest for ocean cargo in February 2026
CBP published a proposed rule on February 10, 2026 to require electronic export manifest (EEM) filing in ACE for vessel cargo before departure from the United States. The rule aimed to give CBP visibility into outbound vessel shipments. CBP accepted public comments on the proposal through April 13, 2026.
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This proposed rule concerns export manifest filing, which Allied does not handle for clients. We are not aware whether CBP has finalized this rule since the comment period closed. Clients who export vessel cargo and want to know its current status should ask Allied or check the CBP EEM webpage directly.
The summaries and positions are general information, not legal advice. Always check the official CBP message, which each page links to.
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