When you enter a number from a Customs document, we automatically check whether its structure matches that in the various Customs systems. If the document number is incorrect, you will receive an error message.
This way, we reduce the chance of errors for you and prevent problems when collecting the container at a terminal. A simple example: an MRN number always has 18 characters. If you enter an MRN number with 17 characters, you will receive an error message.
For each type of Customs document, there are various criteria that are automatically verified by the Port Community System (PCS). See the article Which document type should I use in which situation?
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