How To Fix VN025 - Output & for medium &, partner function & is not defined

VN025 - Overview

• Message type: E = Error

• Message class: VN - Nachrichtensteuerung

• Message number: 025

• Message text: Output & for medium &, partner function & is not defined

What causes this issue?

You have selected a combination of output and partner function which
has not been defined.

How to fix this error?

INCLUDE NA_EINGABE_PRUEFEN
This is a warning message. You can proceed by pressing ENTER.
To prevent the warning message from appearing again, assign the
required partner function to your output type in table TNAPN.

<DS:TRAN.NACT>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.

VN025 - Details

• The SAP error message:
  VN025 Output & for medium & , partner function & is not defined
  typically occurs in the context of Vendor Master data or Purchase Order processing, specifically related to the output determination procedure.
  
  Explanation of the Error Message
  
  Message Class: VN (Vendor)
  Message Number: 025
  Message Text: Output & for medium & , partner function & is not defined
  
  The placeholders (&) are replaced by actual values during runtime, for example:
  
  Output type (e.g., NEU for purchase order output)
  Medium (e.g., 1 for print, 5 for email)
  Partner function (e.g., VN for vendor)
  
  
  Cause
  This error occurs because the system is trying to determine an output for a document (like a Purchase Order or Vendor Master data) but cannot find a valid partner function assigned for the specified output medium.
  In other words:
  
  The output type is configured to send output via a certain medium (print, email, fax, etc.).
  The system looks for a partner function (e.g., vendor, ordering address) that