Document number range status is incorrect

What causes this issue?

Processing of the document was terminated due to an inconsistency in
the document number assignment. Document number &V1& already exists in
company code &V2&.

How to fix this error?

Check the number range status in company code &V2& for object
FIAA-BELNR. Probably the number range status was overwritten by a
transport by mistake.
<DS:TRAN.SNRO>Proceed</>

Error message extract from SAP system. Copyright SAP SE.