First determine whether the supplemental document affects cargo release. Requests affecting release should be handled by deadline, while those that do not can be completed within normal timeframes. Record all requests in one tracking sheet, including the request date, responsible personnel, and submission status.
In implementation, destination-country market-entry, tax, registration, and local procedures must still be rechecked under the latest requirements of competent authorities, licensed organizations, and applicable contractual provisions.
For the sequence of customs document preparation, see How to Avoid Customs Clearance Problems When Importing Cars.