How To Fix CM_SUB_API006 - Composition hierarchy tree (start &1, end &2) contains a cycle

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_SUB_API - API Substance

• Message number: 006

• Message text: Composition hierarchy tree (start &1, end &2) contains a cycle

What causes this issue?

In the composition hierarchy tree, the start specification &V1&
contains the end specification &V2& directly or indirectly, which, in
turn, contains the start specification &V1& directly.

System Response

You can run the search, but the search result may possibly contain
errors because of the cycle.

How to fix this error?

Remove the cycle by correcting the compositions of the specifications.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM_SUB_API006 - Composition hierarchy tree (start &1, end &2) contains a cycle ?

  The SAP error message CM_SUB_API006 indicates that there is a cycle in the composition hierarchy tree between the specified start and end nodes. This means that the hierarchy structure is not valid because it loops back on itself, which can lead to infinite loops or incorrect data processing.
  Cause:
  The cycle in the composition hierarchy can occur due to several reasons:
  
  Incorrect Hierarchy Definition: The hierarchy may have been defined incorrectly, where a node is inadvertently linked back to one of its ancestors.
  Data Entry Errors: Manual data entry errors can lead to incorrect parent-child relationships in the hierarchy.
  System Bugs: In some cases, bugs in the system or during data migration can create unintended cycles.
  
  Solution:
  To resolve the error, you can follow these steps:
  
  
  Analyze the Hierarchy:
  
  Use transaction codes like CMOD or CMMT to visualize the hierarchy and identify where the cycle occurs.
  Check the relationships between the nodes to find the cycle.
  
  
  
  Correct the Hierarchy:
  
  Once you identify the nodes involved in the cycle, you need to correct the relationships. This may involve changing the parent or child assignments to break the cycle.
  Ensure that each node has a valid parent-child relationship without any loops.
  
  
  
  Data Validation:
  
  Implement validation checks to prevent cycles from being created in the future. This can include checks during data entry or batch processing.
  
  
  
  Testing:
  
  After making changes, test the hierarchy to ensure that it functions correctly and that the error no longer occurs.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidelines on managing composition hierarchies.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for managing composition hierarchies, such as CMMT (for managing composition models) and CMOD (for managing composite models).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Support: If the issue persists after attempting to resolve it, consider reaching out to SAP support for further assistance.
  
  By following these steps, you should be able to identify and resolve the cycle in the composition hierarchy tree, eliminating the error message CM_SUB_API006.