Check whether the declaration has actually been cancelled, or whether it is listed in the declaration with the status “Cancelled” or “Closed with exception”. If the declaration has the status “Cancelled”, you can change the status to “Acknowledged” so that the container is moved to the status “Closed with exception” and a new declaration can be created via “New declaration” for the container used. You can also find this with the B/L number at “Manifest container”.