CDS77001Quantity must be provided for Document Category

HMRC explanation

Quantity must be provided
In some cases, when you declare a document status code to indicate a waiver for a licence, you are still required to enter a '0' as the quantity attributed to the licence. This will also require a measurement unit such as GBP.

Source: HMRC, Customs Declaration Service error codes, Open Government Licence v3.0. GOV.UK publication · Licence

What to check across the Document obligation errors

A document code needs further detail that is missing: an identifier, a status code, a quantity, a consignment reference, or a reason for a waiver. Check every document code on the item carries the details HMRC's explanation lists for it.

A declaration that clears CDS can still be wrong

The free eligibility checker confirms your import activity and whether a free post-clearance audit applies. No data upload, no commitment.

Run a free audit

Source: HMRC, Customs Declaration Service error codes, Open Government Licence v3.0. GOV.UK publication · Licence