Appendix H - Census Warning Messages and Override Codes
This appendix provides a list of Census warning messages, the reasons a filer may receive the warning message, suggested options to resolve the warning and override codes that may be used to respond to the warning.
This page provides the message formats and technical specifications necessary to electronically transmit data to CBP's automated systems.
This document may qualify as a “guidance document” as set forth in Executive Order 13891 and interpretations thereof; such guidance documents are not binding and lack the force and effect of law, except as authorized by law or as incorporated into a contract. This document is being posted to this portal to provide stakeholders with useful information.