CSMS Weekly Digest: Feb 28 - Mar 6, 2026
Here's your weekly summary of 5 CSMS messages from U.S. Customs and Border Protection.
Action Required(3)
Key deadlines approaching include new Carnet data elements for ACE Truck Manifest on March 24 and updates to EEM Truck Manifest Implementation Guide 355. Plan for ACE production downtime from 10:00 p.m. ET Saturday, March 7 to 4:00 a.m. ET Sunday, March 8, 2026.
ACE Truck Manifest Enhancement: New Carnet Data Elements Coming March 24
On March 24, 2026, U.S. Customs and Border Protection (CBP) will enhance the Automated Commercial Environment (ACE) to enable trade users to provide ATA Carnet information as part of an electronic tru...
ACE Production Standard Invasive Maintenance from 10:00 p.m. ET Saturday, March 7, 2026, to 4:00 a.m. ET Sunday, March 8, 2026
There will be ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 7, 2026, to 4:00 a.m. ET Sunday, March 8, 2026.
Update to Electronic Export Manifest (EEM) – Truck Manifest Implementation Guide (IG) 355 Acceptance/Rejection Message
U.S. Customs and Border Protection has updated the Electronic Export Manifest (EEM) Automated Commercial Environment (ACE) Exports Truck X12- 355 Acceptance/Rejection Message Implementation Guide (IG)...
System Update(3)
Major enhancements include automated container seal change transmission for ocean and rail shipments deploying to production April 9, 2026, and new Carnet data elements for truck manifests. Updated Electronic Export Manifest truck manifest acceptance/rejection messaging is also being implemented.
Automated Transmission of Container Seal Changes to ACE Manifest for Ocean and Rail Shipments (CBP-199) – Available in ACE CERT Environment Now and Deploying to ACE PROD Environment on April 9, 2026
U.S. Customs and Border Protection (CBP) deployed updates to the Automated Commercial Environment (ACE) Certification (CERT) environment to support the automated transmission of container seal changes...
ACE Truck Manifest Enhancement: New Carnet Data Elements Coming March 24
On March 24, 2026, U.S. Customs and Border Protection (CBP) will enhance the Automated Commercial Environment (ACE) to enable trade users to provide ATA Carnet information as part of an electronic tru...
Update to Electronic Export Manifest (EEM) – Truck Manifest Implementation Guide (IG) 355 Acceptance/Rejection Message
U.S. Customs and Border Protection has updated the Electronic Export Manifest (EEM) Automated Commercial Environment (ACE) Exports Truck X12- 355 Acceptance/Rejection Message Implementation Guide (IG)...
System Maintenance(2)
Two scheduled maintenance windows will impact ACE systems: production environment downtime March 7-8, 2026, and certification environment maintenance March 4, 2026 from 5:00-8:00 p.m. ET.
ACE Production Standard Invasive Maintenance from 10:00 p.m. ET Saturday, March 7, 2026, to 4:00 a.m. ET Sunday, March 8, 2026
There will be ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, March 7, 2026, to 4:00 a.m. ET Sunday, March 8, 2026.
ACE Certification Standard Invasive Maintenance Window on March 4, 2026 from 5:00 p.m. ET to 8:00 p.m. ET
There will be an ACE certification standard invasive maintenance window on March 4, 2026, from 5:00 p.m. ET to 8:00 p.m. ET.