How To Fix W0006 - The MG hierarchy level field cannot be maintained

SAP Error Message - Details

• Message type: E = Error

• Message class: W0 - Customizing - ISR

• Message number: 006

• Message text: The MG hierarchy level field cannot be maintained

What causes this issue?

You did not select the indicators for
"Assign MG to value-only material" and "MG stock to value-only
material".
You therefore are not allowed to maintain the MG hierarchy level field.

How to fix this error?

Set the flags as required or delete the MG hierarchy level.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W0006 - The MG hierarchy level field cannot be maintained ?

  Certainly! Here's detailed information about the SAP error message:
  
  SAP Error Message:
  W0006 - The MG hierarchy level field cannot be maintained
  
  Cause:
  This warning message typically occurs when you try to maintain or change the Material Group (MG) hierarchy level field in a way that is not allowed by the system. The MG hierarchy is a structured classification of material groups, and certain hierarchy levels are system-controlled or restricted from manual changes.
  Common causes include:
  
  Attempting to manually edit or maintain the hierarchy level field directly in the material master or material group maintenance transaction.
  Trying to assign a hierarchy level that does not exist or is not allowed in the current configuration.
  The hierarchy level field is derived from the structure of the material group hierarchy and cannot be changed independently.
  The system controls the hierarchy levels based on the material group structure, so manual maintenance is restricted.
  
  
  Explanation:
  
  The Material Group (MG) hierarchy is used to classify materials in a multi-level structure.
  The hierarchy level field indicates the level of the material group in the hierarchy.
  This field is system-determined based on the position of the material group in the hierarchy tree.
  Therefore, it cannot be manually maintained or changed by users.
  
  
  Solution:
  
  
  Do not attempt to manually maintain or change the hierarchy level field.
  
  
  To change the hierarchy level or structure, you need to maintain the material group hierarchy itself, not the hierarchy level field.
  
  
  Use the appropriate transaction or IMG path to maintain the material group hierarchy:
  
  Transaction code: OMS2 (Material Groups)
  Or via SPRO:
  
  Logistics - General > Material Master > Settings for Key Fields > Define Material Groups
  
  
  
  When you create or change material groups in OMS2, the system automatically assigns the correct hierarchy level.
  
  
  If you need to restructure the hierarchy, do it by changing the parent-child relationships of material groups, not by editing the hierarchy level field directly.
  
  
  After adjusting the hierarchy, the system will update the hierarchy level fields accordingly.
  
  
  
  Additional Information:
  
  This message is a warning (W0006), so it may not stop the process but indicates that the field cannot be maintained as attempted.
  The hierarchy level field is important for reporting and classification purposes.
  Always maintain material groups and their hierarchy via the standard SAP customizing tools.
  If you encounter this message during data upload or mass changes, ensure your data respects the hierarchy structure and do not try to overwrite the hierarchy level field.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Message
  W0006 - The MG hierarchy level field cannot be maintained
  
  
  Cause
  Attempt to manually maintain a system-controlled hierarchy level field
  
  
  Solution
  Maintain material group hierarchy via OMS2 or SPRO; do not edit hierarchy level field directly
  
  
  Related TCode
  OMS2 (Material Groups)
  
  
  Notes
  Hierarchy level is system-derived from material group structure; manual changes not allowed
  
  
  
  
  If you need help with maintaining material groups or restructuring the hierarchy, I can provide step-by-step guidance.