CDS77000Obligation Error: ID must be provided for declared Document Code

HMRC explanation

Document identifier required
Instructions for how to use the code are given in the 'Conditions' box for the commodity code and Appendix 5A.

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

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