ACE Import Manifest Update: New Carnet Error Codes Available in CERT

U.S. Customs and Border Protection (CBP) has enhanced the Automated Commercial Environment (ACE) certification environment (CERT) to enable filers to submit a Carnet number and expiration date via an ACE truck import manifest filing.
Accordingly, CBP has updated following truck implementation guides:
ANSI X12 Truck 309 Customs Manifest [ https://www.cbp.gov/document/technical-documentation/ace-truck-manifest-309-message ]
 * Added new Bill of Lading Type code for Carnet (40) 
 * Added new Reference Identification Qualifier for “Carnet Number” (CRN) and “Carnet Expiration” (CRE) 
EDIFACT Truck CUSCAR Import Manifest [ https://www.cbp.gov/document/guidance/standard-truck-manifest-cuscar-cargo-report-message ]
 *  Added new Document Name code type for Carnet (40) 
 * Added new Document Name code for “Carnet Number” (960) and “Carnet Expiration” (961) 
EDIFACT Truck CUSRES Accept/Reject Manifest [ https://www.cbp.gov/document/guidance/ace-customs-response-message ] and
ANSI X12 Truck 355 Accept/Reject Manifest [ https://www.cbp.gov/document/technical-documentation/ace-truck-manifest-ansi-x12-355-message ]
 * Added new error codes 
 * 551 – INVALID OR MISSING CARNET NUMBER 
 * 552 – INVALID OR MISSING CARNET EXPIRATION DATE 
Software developers and trade filers who submit manifest transactions via Electronic Data Interchange (EDI) will need to make the appropriate updates to incorporate these changes.
CBP plans to deploy these changes to the production environment (PROD) on March 24, 2026.
For technical questions, contact your CBP Client Representative. For other questions, contact CREM@cbp.dhs.gov.
Related Message Number(s): 67120036