LRN
Internal declaration reference, EORI and customs procedures.
Definition
The LRN is created by the declarant's (or customs representative's) system to identify the declaration in its own workflow, before customs accepts it. Once the declaration is accepted, customs returns the MRN, which becomes the official reference. The LRN must be unique on the declarant side and is not reusable.
Origin
Data element defined by the WCO Data Model and the Union Customs Code (EU Regulation 952/2013), used in the European Commission's NCTS, AES and ICS2 systems.
Example in context
A customs representative submits a declaration with LRN ACME-2025-000187; after acceptance, customs responds with the matching MRN.