Diagnosis
The Nota Fiscal has been automatically generated by an application. Theusual way of reversing the Nota Fiscal is via that application.

Procedure
You should only continue if you definitely want to reverse the NotaFiscal manually. The usual procedure is to reverse it from theapplication (e.g. billing document, invoice check). Manually reversingthe Nota Fiscal is only recommended if the original document has beenreversed without the Nota Fiscal.