Document type & must have internal number assignment for reversal

What causes this issue?

When reversing a document, the document number is determined by the
system for the reverse document. Therefore, the reverse document type
must refer to a document number range with internal number assignment.

System Response

The reverse document is not posted.

How to fix this error?

See to it that a reverse document type with internal number assignment
is entered for the document type of the document which is to be
reversed.
IF &DEVICE& = 'SCREEN'
<DS:TRAN.OBA7>Proceed</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.