How To Fix SMT_CONFIG124 - Field &1 is not defined as a change structure key field

SMT_CONFIG124 - Overview

• Message type: E = Error

• Message class: SMT_CONFIG - Configuration message class

• Message number: 124

• Message text: Field &1 is not defined as a change structure key field

Self-Explanatory Message

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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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Smart SAP Assistant

• What is the cause and solution for SAP error message SMT_CONFIG124 - Field &1 is not defined as a change structure key field ?

  The SAP error message SMT_CONFIG124 indicates that a specific field (denoted as &1 in the error message) is not defined as a key field in a change structure. This error typically arises in the context of SAP's System Landscape Transformation (SLT) or when configuring data replication scenarios.
  
  Cause:
  
  Field Not Defined as Key: The field you are trying to use in a change structure is not marked as a key field in the relevant table or structure. In SLT, key fields are essential for identifying unique records during data replication.
  
  Configuration Issues: There may be a misconfiguration in the SLT configuration settings or the data model that does not align with the source system's structure.
  Data Model Changes: If there have been recent changes to the data model (e.g., adding or removing fields), the change structure may not have been updated accordingly.
  
  
  Solution:
  
  
  Check Field Definition:
  
  Go to the Data Dictionary (transaction SE11) and check the definition