To find out information about common error codes and how to resolve them, please refer to the relevant guides:
- Guidance for common errors on entry summary and simplified frontier declarations
- Guidance for common errors on supplementary declarations
These guides will help you to:
- Understand how to interpret the text of an error message in the TSS portal
- Understand the meaning of some of the most common error messages and how to resolve them
Further information and an extended list of error codes can be found here.