Obligation, format and value errorsDomain & value

CDS10021Data Error: Value must be positive

HMRC explanation

You appear to have entered a negative value
A negative amount has been declared for writing off a licence. The quantity being written off for a licence must be equal to or greater than zero

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

What to check across the Obligation, format and value errors

A single data element has failed: it is missing or incomplete, not allowed on this declaration, repeated more often than permitted, in the wrong format, or carries a value that is not recognised. Check the element named in the error is completed in full, in the expected format, and only where the declaration type allows it. A negative item customs value points back to the valuation data on that item.

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