How To Fix VP020 - Function module ZZ_USEREXIT_PARTNER does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: VP - Vertriebsbelegpartner

• Message number: 020

• Message text: Function module ZZ_USEREXIT_PARTNER does not exist

Self-Explanatory Message

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• What is the cause and solution for SAP error message VP020 - Function module ZZ_USEREXIT_PARTNER does not exist ?

  The SAP error message:
  VP020 Function module ZZ_USEREXIT_PARTNER does not exist
  typically occurs when the system tries to call a user-exit function module named ZZ_USEREXIT_PARTNER, but this function module is not found in the system.
  
  Cause
  
  The system is configured to call a custom user-exit function module ZZ_USEREXIT_PARTNER during partner determination or partner processing in SD (Sales and Distribution) or another related module.
  However, the function module ZZ_USEREXIT_PARTNER has not been created or is missing in the system.
  This can happen if:
  
  The function module was never implemented.
  The function module was deleted or transported incorrectly.
  The configuration points to a non-existent function module.
  
  
  
  
  Where does this happen?
  
  In partner determination procedures, SAP allows you to enhance or modify partner determination logic by specifying a user-exit function module.
  This is often done in transaction SPRO under:
  
  Sales and Distribution ? Basic Functions ? Partner Determination ? Partner Determination Procedures ? Define Partner Determination Procedures
  
  
  Or in the partner determination procedure configuration, a user-exit FM is specified.
  When the system tries to call this FM during partner determination, it throws the error if the FM does not exist.
  
  
  Solution
  
  
  Check the configuration:
  
  Go to the partner determination procedure configuration and check if ZZ_USEREXIT_PARTNER is specified as a user-exit function module.
  Transaction codes to check partner determination:
  
  VOPA (Partner determination procedures)
  VOTXN (Partner functions)
  
  
  If the FM is specified but does not exist, you need to either:
  
  Create the function module.
  Or remove/change the FM name in the configuration.
  
  
  
  
  
  Create the function module:
  
  If the business requirement is to have a custom user-exit, create the function module ZZ_USEREXIT_PARTNER in SE37.
  The function module should have the correct interface as expected by the partner determination logic.
  Usually, the function module is a user-exit with a specific interface (parameters) defined by SAP.
  You can copy an existing standard user-exit FM and modify it accordingly.
  
  
  
  Remove or correct the FM name:
  
  If the FM is not needed, remove the reference from the configuration.
  Or correct the FM name if it was misspelled.
  
  
  
  Check transports and system consistency:
  
  If the FM existed in development but is missing in production, check transport logs.
  Reimport the transport containing the FM.
  
  
  
  
  Additional Information
  
  User-exit function modules for partner determination are a common enhancement point in SD.
  The naming convention ZZ_ indicates a custom development.
  Always check the interface of the FM expected by SAP partner determination.
  SAP standard user-exits for partner determination include function modules like USEREXIT_PRICING_PREPARE_TKOMK or similar, but custom ones can be created.
  If unsure about the interface, check SAP documentation or standard user-exits for partner determination.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  System tries to call non-existent FM ZZ_USEREXIT_PARTNER during partner determination.
  
  
  Solution
  Create the FM with correct interface or remove/change the FM name in configuration.
  
  
  Where to check
  Partner determination procedure configuration (SPRO, VOPA, VOTXN).
  
  
  Additional
  Check transports if FM missing in production; follow SAP naming and interface standards.
  
  
  
  
  If you need, I can help you with a sample template for the function module or guide you through the configuration steps.