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Most declaration reference numbers are 18 digits and are usually made up of numbers and letters. The import declaration Entry Reference Number (ERN) consists of

• first 3 numbers are the Entry Processing Unit (EPU)
• then 6 numbers and 1 letter which are the CHIEF entry number (ENO)
• the final 8 numbers are the date from your ERN in the format DDMMYYYY

Example: EPU 123 – ENO 123456A – DOE 01/11/2022