How To Fix SMT_CONFIG121 - Field &1 is already specified as a change structure key field

SMT_CONFIG121 - Overview

• Message type: E = Error

• Message class: SMT_CONFIG - Configuration message class

• Message number: 121

• Message text: Field &1 is already specified as a change structure key field

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMT_CONFIG121 - Field &1 is already specified as a change structure key field ?

  The SAP error message SMT_CONFIG121 indicates that there is a conflict in the configuration of a change structure in the SAP system. Specifically, it means that the field specified (denoted as &1 in the error message) is already defined as a key field in the change structure, and you are attempting to define it again, which is not allowed.
  
  Cause:
  
  Duplicate Key Field Definition: The field you are trying to add or modify is already defined as a key field in the change structure.
  Configuration Error: There may be an error in the configuration settings where the same field is being referenced multiple times as a key field.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Change Structure Configuration:
  
  Go to the relevant transaction (e.g., SMT1 for change structures) and review the configuration of the change structure.
  Look for the field specified in the error message and verify its current status as a key field.
  
  
  
  Remove