June 22, 2021
Tips on How to Resolve AES Response Messages
 When a shipment is filed to the AES, a system response message is generated and indicates whether the shipment has been accepted or rejected. If the shipment is accepted, the AES filer receives an Internal Transaction Number (ITN) as confirmation. Though the shipment is accepted, the filer may still receive a Verify Message, Compliance Alert, Informational Message or Warning Message along with their ITN. However, if the shipment is rejected, a Fatal Error notification is received and must be corrected to receive a valid ITN.
To help you take the appropriate action for the different AES Response Messages, here are some tips on how to address the most frequent messages that were generated in AES for this month.
Response Code: 538
Narrative: Shipping Weight Must Be Greater Than Zero For MOT
Severity: Fatal
Reason: The Mode of Transportation Code reported was one that identifies a Vessel, Rail, Truck, or Air shipment and the Shipping Weight was not reported.
Resolution: When the Mode of Transportation is Vessel, Rail, Truck or Air, the Shipping Weight must be reported.
Verify the Mode of Transportation and Shipping Weight, correct the shipment and resubmit.
Response Code: 856
Narrative: Improbable ISO
Severity: Verify
Reason: The ISO Country Code reported may not be valid for the Country of Destination.
Resolution: Valid ISO Country Codes reportable in AES are contained in Appendix C – ISO Country Codes.
Verify the ISO Country Code, correct the shipment and resubmit.
For a complete list of Fatal Error Response Codes, their reasons, and resolutions, see Appendix A – Commodity Filing Response Messages.
It is important that AES filers correct Fatal Errors as soon as they are received in order to comply with the Foreign Trade Regulations. These errors must be corrected prior to export for shipments filed predeparture and as soon as possible for shipments filed postdeparture but not later than five calendar days after departure.
For further information or questions, contact the U.S. Census Bureau's Trade Data Collection Branch.
Telephone: (800) 549-0595, select option 1 for AES
Email: askaes@census.gov
Online: www.census.gov/trade
Blog: blogs.census.gov/globalreach
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