This guide provides information on common error codes triggered by incorrectly submitted Supplementary and Full Frontier declarations, useful for resolving errors and successfully completing declarations.
Updated: 13 June 2023
If you found this guide helpful, you may also be interested in:
Supplementary declarations: Step-by-step guide
Data guide: TSS declaration data requirements
Webinar: How to complete your GB-NI Supplementary declarations on TSS: A step-by-step guide
Checklist: Supplementary declarations