Create a transport chronology from the order to delivery. List every carrier, every leg, every handover, the recorded condition and each entry on the consignment note. Link discrepancies to the original document and the time when they were recorded.
Then separate the claim levels. For the external claim, Article 36 CMR, notices, reservations and the amount of loss are central. For recourse, add payment or a final judgment, notice to the other carriers, Articles 37 to 40 CMR and the period under Article 39 paragraph 4.
Where handover records conflict, the damage location is unknown or several carriers may have contributed, the complete transport file should be reviewed early. This separates the direction of the claim from the internal allocation and keeps both grounded in provable facts.