How To Fix VN2028 - Parter function & transmission medium & not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: VN2 - Output Class for RSNASTCK

• Message number: 028

• Message text: Parter function & transmission medium & not defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message VN2028 - Parter function & transmission medium & not defined ?

  Certainly! Here's a detailed explanation for the SAP error message VN2028: Partner function & transmission medium & not defined:
  
  Error Message
  VN2028: Partner function & transmission medium & not defined
  
  Cause
  This error occurs when the system tries to send a message (such as an output message for purchasing documents, vendor master data, etc.) but cannot find a valid combination of partner function and transmission medium defined in the system.
  In SAP, partner functions (e.g., ordering address, invoicing party) are linked to transmission media (e.g., print, EDI, email) to determine how and where messages should be sent. If this link is missing or not maintained, the system cannot process the output and throws this error.
  
  Where it typically occurs
  
  When processing output messages for purchasing documents (POs, contracts, scheduling agreements).
  When sending vendor master data or other partner-related communications.
  During message determination and output processing.
  
  
  Solution
  
  
  Check Partner Function and Transmission Medium Configuration:
  
  Go to SPRO ? Materials Management ? Purchasing ? Messages ? Output Control ? Partner Determination.
  Verify that the partner function involved in the message output is assigned to the correct transmission medium.
  For example, if the partner function is "Ordering Address" and the transmission medium is "Print" or "EDI," ensure this combination is maintained.
  
  
  
  Maintain Partner Functions in Vendor Master:
  
  Check the vendor master data (transaction XK02 or MK02) to ensure the partner functions are correctly assigned.
  Make sure the partner function exists and is active for the relevant vendor.
  
  
  
  Maintain Output Types and Partner Functions:
  
  Check the output type configuration (transaction NACE for purchasing output).
  Verify that the output type has the correct partner function and transmission medium assigned.
  
  
  
  Check Message Determination Procedure:
  
  Ensure that the message determination procedure includes the correct partner function and transmission medium.
  Adjust if necessary.
  
  
  
  Example:
  
  If the output type is set to send a PO via EDI to the vendor's ordering address, but the partner function "Ordering Address" is not linked to the transmission medium "EDI," the system will throw VN2028.
  To fix, assign the transmission medium "EDI" to the partner function "Ordering Address" in the partner determination settings.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  NACE – Output Types
  SPRO – Customizing for Partner Determination
  XK02 / MK02 – Change Vendor Master
  ME23N – Display Purchase Order (to check output messages)
  
  
  
  SAP Notes:
  
  Check SAP Notes related to output determination and partner functions if the problem persists.
  
  
  
  Documentation:
  
  SAP Help Portal documentation on Output Determination and Partner Functions.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Missing or incorrect assignment of partner function and transmission medium combination.
  
  
  Effect
  Output message cannot be processed; error VN2028 is raised.
  
  
  Solution
  Maintain partner function and transmission medium assignment in customizing and vendor master.
  
  
  Key Transactions
  NACE, SPRO, XK02, MK02
  
  
  
  
  If you need, I can guide you step-by-step on how to check and maintain these settings in your SAP system.