How To Fix MD_SUBSTN023 - Rule &1 is also used in source &2

SAP Error Message - Details

• Message type: E = Error

• Message class: MD_SUBSTN - Messages for Master Data Substitution

• Message number: 023

• Message text: Rule &1 is also used in source &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MD_SUBSTN023 - Rule &1 is also used in source &2 ?

  The SAP error message MD_SUBSTN023 indicates that there is a conflict in the substitution rules defined in the system. Specifically, it means that the substitution rule you are trying to create or modify (denoted by &1) is also being used in another source (denoted by &2). This can occur in the context of material requirements planning (MRP) or other planning processes where substitution rules are applied.
  Cause:
  
  Duplicate Rule Usage: The substitution rule you are trying to use is already assigned to another source, which prevents it from being used in the current context.
  Configuration Error: There may be a misconfiguration in the way substitution rules are set up in the system.
  Data Integrity Issues: There could be inconsistencies in the data that lead to the same rule being referenced multiple times inappropriately.
  
  Solution:
  
  Review Substitution Rules: Check the existing substitution rules in the system. You can do this by navigating to the relevant transaction (e.g., MD61 for planning) and reviewing the rules assigned to the source.
  Modify or Delete Conflicting Rule: If the rule is indeed being used elsewhere and you need to use it in the current context, consider modifying the existing rule or creating a new one that does not conflict.
  Check Assignments: Ensure that the rule assignments are correct and that there are no unintended overlaps in the usage of substitution rules.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on how to manage substitution rules effectively.
  Contact SAP Support: If the issue persists and you cannot resolve it, consider reaching out to SAP support for assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MD61 (Create Planning) or MD62 (Change Planning) to manage substitution rules.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide specific fixes or updates.
  User Roles and Authorizations: Ensure that you have the necessary permissions to create or modify substitution rules in the system.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.