Check that the deed of transfer (External link) details separately both the watercraft and its engine, even if they are sold as parts of a single package, for instance in the case of water scooters, as well as the details of the seller and the buyer.
Check that you have declarations of conformity for both the new boat and the engine. You usually find the declarations of conformity in between the user's manual.
Make sure you enter the engine serial number in the correct format . Different makes have different serial number formats. Having the correct engine serial number is important to make sure that the system can find the information if the engine has already been registered or if the manufacturer has submitted an advance notification.
Scan or photograph the documents before you start filling in the notification.