CFOP Determination in Invoice Verification (MM) 
To make automatic Nota Fiscal creation possible, it is necessary to determine the CFOP code. You can maintain this Customizing table by choosing the Customizing path for
Determination incoming/return.You can assign a CFOP code to a combination of the fields:
All of these fields are mandatory for automatic CFOP determination. In addition, you can specify the following two fields.
The selection sequence is as follows:

If Invoice Verification cannot determine a CFOP via the table CFOP determination, you must enter a CFOP manually. This must be done in the Nota Fiscal dialog.