SAP Message 8B260 - Reference Nota Fiscal & not found

Diagnosis
The document number of the reference Nota Fiscal & can not be found.

System Response
Material document - Nota Fiscal interface error.
The material document is Nota Fiscal relevant and requires a referenceto an existing Nota Fiscal.

Procedure
Please correct the Nota Fiscal number of the reference Nota Fiscal inthe material document header text field.