CSMS Weekly Digest: Mar 28 - Apr 3, 2026
Here's your weekly summary of 10 CSMS messages from U.S. Customs and Border Protection.
Action Required(7)
Seven items demand attention this week, led by updated Section 232 duty guidance on aluminum, steel, and copper and a new ACE Portal account application process. Brokers should also review updated implementation guidance for container seal changes, stow plan processing updates, and the EEM Schedule K port code revision before the April 4–5 ACE maintenance window.
Section 232 Duties on Imports of Aluminum, Steel, and Copper
The purpose of this message is to provide guidance on the implementation of the April 2, 2026, Proclamation, “Strengthening Actions Taken to Adjust Imports of Aluminum, Steel, and Copper into the Unit...
U.S. Drug Enforcement Agency Implementation Guide Moved from Draft Section of CBP.gov
The U.S. Drug Enforcement Agency (DEA) Implementation Guide (IG) can now be found in the “Implementation Guidelines: Ready for Coding” section of CBP.gov: https://www.cbp.gov/trade/automated/catair T...
Automated Transmission of Container Seal Changes to ACE Manifest for Ocean and Rail Shipments – UPDATED Trade Information Notice Now Available
U.S. Customs and Border Protection (CBP) published an updated version of the *Automated Transmission of Container Seal Changes to ACE Manifest Trade Information Notice *here [ https://www.cbp.gov/docu...
Changes to Stow Plan Processing
On May 14, 2026, CBP plans to deploy several changes to Stow Plan processing to the Automated Commercial Environment (ACE) certification environment. These changes will impact error conditions for ves...
ACE Production Standard Invasive Maintenance from 10:00 p.m. ET Saturday, April 4, 2026, to 4:00 a.m. ET Sunday, April 5, 2026
There will be ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, April 4, 2026, to 4:00 a.m. ET Sunday, April 5, 2026.
New ACE Portal Account Application Now Available
On April 1, 2026, U.S. Customs and Border Protection (CBP) released a modernized ACE Secure Data Portal (ACE Portal) account application for the trade community. The new digital web form facilitates: ...
Electronic Export Manifest (EEM) – Appendix O – Schedule K Implementation Guide (IG) Update – Port of Unlading Code 42876-Hamburg
Electronic Export Manifest (EEM) will be implementing an update to the CBP Export Manifest Appendix O – Schedule K. The update implemented is the inclusion of Port of Unlading Code: * 42876 – Ham...
Tariff(1)
CBP has issued updated guidance on Section 232 duties covering imports of aluminum, steel, and copper — brokers should review the message carefully to confirm compliance with any revised rates, exclusions, or filing requirements.
Pga Update(1)
The DEA Implementation Guide has been moved from the draft section of CBP.gov to its final location, meaning brokers should update any bookmarks or references and treat the guide as the current, authoritative source for DEA-related filing requirements.
System Update(5)
Several ACE system changes are in effect or upcoming, including automated container seal change transmissions for ocean and rail manifests, modifications to stow plan processing, a new ACE Portal account application, and a Schedule K port code update for Hamburg — review each Trade Information Notice to ensure your systems and workflows are aligned.
Automated Transmission of Container Seal Changes to ACE Manifest for Ocean and Rail Shipments – UPDATED Trade Information Notice Now Available
U.S. Customs and Border Protection (CBP) published an updated version of the *Automated Transmission of Container Seal Changes to ACE Manifest Trade Information Notice *here [ https://www.cbp.gov/docu...
Changes to Stow Plan Processing
On May 14, 2026, CBP plans to deploy several changes to Stow Plan processing to the Automated Commercial Environment (ACE) certification environment. These changes will impact error conditions for ves...
New ACE Portal Account Application Now Available
On April 1, 2026, U.S. Customs and Border Protection (CBP) released a modernized ACE Secure Data Portal (ACE Portal) account application for the trade community. The new digital web form facilitates: ...
: REMINDER: New Carnet Data Elements Now in ACE Truck Manifest – Trade User Support Call Happening Today
On March 24, 2026, U.S. Customs and Border Protection (CBP) enhanced the Automated Commercial Environment (ACE) to enable trade users to provide ATA Carnet information as part of an electronic truck m...
Electronic Export Manifest (EEM) – Appendix O – Schedule K Implementation Guide (IG) Update – Port of Unlading Code 42876-Hamburg
Electronic Export Manifest (EEM) will be implementing an update to the CBP Export Manifest Appendix O – Schedule K. The update implemented is the inclusion of Port of Unlading Code: * 42876 – Ham...
System Maintenance(2)
ACE Certification will be unavailable April 1 from 5:00–8:00 p.m. ET, and ACE Production will undergo invasive maintenance April 4 from 10:00 p.m. through April 5 at 4:00 a.m. ET — plan filings and testing accordingly to avoid disruptions.
ACE Production Standard Invasive Maintenance from 10:00 p.m. ET Saturday, April 4, 2026, to 4:00 a.m. ET Sunday, April 5, 2026
There will be ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, April 4, 2026, to 4:00 a.m. ET Sunday, April 5, 2026.
ACE Certification Standard Invasive Maintenance Window on April 1, 2026 from 5:00 p.m. ET to 8:00 p.m. ET
There will be an ACE certification standard invasive maintenance window on April 1, 2026 from 5:00 p.m. ET to 8:00 p.m. ET.
General Notice(1)
CBP has cancelled the NCSD webinars previously scheduled for April 7 and 9, 2026 — brokers expecting to attend should watch for any rescheduling notices.