A sent manifest cannot be deleted.
The manifest must always feature at least one container with a document.
What you can do is enter a ‘non-existent’ document and link this to a ‘non-existent’ container number. You must request permission from Customs for this. If you have received permission from Customs, you can enter the ‘fake’ document and link it to the manifest.
For example:
Document type: ZZZ
Container number ERROR0000001
Document number: Date of exit
Booking number: WRONGLYSUBMITTED
Next, you can send an UPDATE to Customs listing the document without all other containers; the other containers must be deleted.
The export manifest remains in the system.