This error message indicates that the document number has already been pre-notified. This may have been done by the own company or by another party, e.g. the carrier, customs agent or terminal.
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Every user of this service also has access to the Track & Trace Export service. In the main screen, where all services are listed, go to the Track & Trace Export service. If the own company made the pre-notification, the pre-notification can be looked up directly. The timeline shows which company submitted the pre-notification. If the pre-notification is not found immediately, it must first be added via the booking number (select ‘+ Add’ in the top right-hand corner).