How To Fix VP020 - Function module ZZ_USEREXIT_PARTNER does not exist

VP020 - Overview

• Message type: E = Error

• Message class: VP - Vertriebsbelegpartner

• Message number: 020

• Message text: Function module ZZ_USEREXIT_PARTNER does not exist

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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VP020 - Details

• 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