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When a TAN needs to be validated, simply key it into the Enter a TAN field and click Validate TAN. A valid or invalid status should then be displayed. If the TAN is found to be valid, the trip can be booked.
Otherwise, the traveller or travel arranger will either need to check they are providing the TAN they have been given, or obtain another TAN. Once you have validated a TAN (or found it to be invalid), you can validate another one, if needed, by simply deleting the text in the Enter a TAN field, typing in the new TAN and clicking Validate TAN again.