CDS DE 7/10 Container Identification Number

Good moring, CDS allows to process entry without adding a container number. According to the following guidance: "If the exact details are unavailable when the declaration is lodged, unknown may be entered, but the details must be entered later. " What would occur if the container number isn't updated on time? How can it be amended after the entry has been departed? https://www.gov.uk/government/publications/cds-uk-trade-tariff-volume-3-import-declaration-completion-guide/group-7-transport-information-modes-means-and-equipment Thank you in advance,

The container number is not a requirement and UNKNOWN is acceptable. Like on road freight TBA is acceptable. Shipping lines just need a DUCR Rich

Hi,
You can use the online service (form C81) to make an amendment to export declarations for statistical purposes.
Make an amendment to export declarations
Thank you.