/INCMD/MSG421 - Loop detected with supersession chain &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /INCMD/MSG -

• Message number: 421

• Message text: Loop detected with supersession chain &1

Self-Explanatory Message

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AnswerBot

• What is the cause and solution for SAP error message /INCMD/MSG421 - Loop detected with supersession chain &1 ?

  The SAP error message /INCMD/MSG421 Loop detected with supersession chain &1 typically indicates that there is a circular reference in the supersession chain of materials. This means that one material is set to supersede another, which in turn is set to supersede the first material, creating a loop. This can lead to issues in material management, as the system cannot determine a clear progression of supersession.
  Cause:
  
  Circular Supersession: The primary cause of this error is a circular reference in the supersession relationships between materials. For example, Material A supersedes Material B, Material B supersedes Material C, and Material C supersedes Material A.
  Incorrect Configuration: The configuration of the material master data may have been incorrectly set up, leading to unintended relationships.
  Data Migration Issues: If data was migrated from another system, it may have introduced inconsistencies or loops in the supersession data.
  
  Solution:
  
  Identify the Loop: Use transaction codes like MM03 (Display Material) or MM02 (Change Material) to check the supersession relationships of the materials involved. Look for the materials that are part of the loop.
  Correct the Supersession Relationships: Once the loop is identified, you need to correct the supersession relationships. This may involve:
  
  Removing the supersession relationship that creates the loop.
  Adjusting the supersession chain to ensure a clear, linear progression without circular references.
  
  
  Data Validation: After making changes, validate the data to ensure that no new loops have been introduced and that the supersession relationships are logical and correct.
  Testing: Perform tests to ensure that the changes have resolved the issue and that the materials can be processed without errors.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM03, MM02, and possibly SE11 (Data Dictionary) to analyze the underlying database tables.
  Material Master Data: Understand the structure of material master data and how supersession is defined within your organization.
  Documentation: Review SAP documentation or help files related to material management and supersession to gain a deeper understanding of best practices and configurations.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on managing supersession chains.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a consultant who specializes in material management within SAP.