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Additional errorsOther
CDS19999Additional errors found
HMRC explanation
What to check across the Additional errors
A general code that signals further errors on the declaration. Work through the other error codes returned with it and read HMRC's explanation before changing anything.
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