CSMS Weekly Digest: Sep 5 - Sep 11, 2026
Here's your weekly summary of 6 CSMS messages from U.S. Customs and Border Protection.
Action Required(2)
Brokers handling Canadian goods should review the Section 338 additional duty modifications immediately, as tariff changes may affect classification and duty calculations on current entries. Additionally, a new ITN validation requirement for EEI submissions via DIS has been deployed to the ACE certification environment — review the updated implementation guide to prepare for production rollout.
Modifying Section 338 Additional Duties on Certain Goods of Canada
The purpose of this message is to provide guidance on the modifications to the Section 338 Canada duties pursuant to the Presidential Proclamations" "on" Modifying the Scope of Products of Canada Subj...
Document Image System (DIS) Validation of Internal Transaction Number (ITN) for Electronic Export Information (EEI) Submissions (CBP-255) Deployed to ACE in the Certification Environment and Updated DIS Implementation Guide is Now Available
U.S. Customs and Border Protection (CBP) has deployed the following enhancement to the Automated Commercial Environment (ACE) Certification Environment: Document Imaging System (DIS) Validation of Int...
Tariff(1)
CBP has issued modifications to Section 338 additional duties on certain goods of Canada — review CSMS #69851916 closely to determine which HTS subheadings are affected and update duty rate calculations accordingly.
System Update(2)
Two notable ACE system updates are in effect this week: the DIS ITN validation for EEI submissions (CBP-255) is now live in certification with an updated implementation guide available, and the Ocean CAMIR Export Manifest Input IG has been revised — filers using either system should review the updated documentation.
Document Image System (DIS) Validation of Internal Transaction Number (ITN) for Electronic Export Information (EEI) Submissions (CBP-255) Deployed to ACE in the Certification Environment and Updated DIS Implementation Guide is Now Available
U.S. Customs and Border Protection (CBP) has deployed the following enhancement to the Automated Commercial Environment (ACE) Certification Environment: Document Imaging System (DIS) Validation of Int...
Update to Ocean CAMIR Export Manifest – Input to Customs and Border Protection Implementation Guide (IG)
U.S. Customs and Border Protection has updated the ACE Ocean CAMIR Export Manifest – Input to Customs and Border Protection Implementation Guides (IG). Updates implemented: * Updated description i...
System Maintenance(1)
ACE Production will undergo standard invasive maintenance from 10:00 p.m. ET Saturday, September 12, 2026, through 4:00 a.m. ET Sunday, September 13, 2026 — plan filings and client communications accordingly to avoid disruption during this window.
General Notice(2)
CBP's ACE User Satisfaction Survey is in its final hours — if you haven't submitted feedback yet, this is the last opportunity to do so before the survey closes.
LAST CALL: Final Hours Before the ACE User Satisfaction Survey Closes
Feedback! Attention all ACE users - the 2026 ACE User Satisfaction Survey is now open, and CBP wants to hear from you! Fill out the satisfaction survey and let your voice be heard! U.S. Customs and ...
Only a Few Days Left to Share Your Feedback on ACE
Survey 2 Attention all ACE users - the 2026 ACE User Satisfaction Survey is now open, and CBP wants to hear from you! Fill out the satisfaction survey and let your voice be heard! U.S. Customs and B...