How To Fix CMMD021 - Error in the hierarchy structure

CMMD021 - Overview

• Message type: E = Error

• Message class: CMMD -

• Message number: 021

• Message text: Error in the hierarchy structure

What causes this issue?

An error occurred when reading the hierarchy data from the database.
This error caused the program to terminate.
A possible reason for the error may be an incompletely maintained
hierarchy data record (a missing entry for the initial access node in
the article hierarchy).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check the relevant data records in the corresponding database tables.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMMD021 - Error in the hierarchy structure ?

  The SAP error message CMMD021, which indicates "Error in the hierarchy structure," typically arises in the context of SAP's Master Data Management, particularly when dealing with hierarchical data structures such as those found in classification, materials management, or organizational structures.
  
  Cause:
  The error can be caused by several factors, including:
  
  Incorrect Hierarchy Structure: The hierarchy may not be properly defined, leading to inconsistencies in parent-child relationships.
  Missing Nodes: A node that is referenced in the hierarchy may not exist or may have been deleted.
  Circular References: There may be circular references in the hierarchy, where a node indirectly references itself.
  Data Integrity Issues: There may be issues with the underlying data, such as missing or incorrect attributes that are required for the hierarchy to function correctly.
  Authorization Issues: The user may not have the necessary permissions to view or modify the hierarchy.
  
  
  Solution:
  To resolve the CMMD021 error, you can take the following steps:
  
  
  Check Hierarchy Structure:
  
  Review the hierarchy structure