How To Fix HPC021 - Class &1 of class type &2 is duplicated in hierarchy type &3

SAP Error Message - Details

• Message type: E = Error

• Message class: HPC - Classification-Based Product Hierarchy

• Message number: 021

• Message text: Class &1 of class type &2 is duplicated in hierarchy type &3

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message HPC021 - Class &1 of class type &2 is duplicated in hierarchy type &3 ?

  The SAP error message HPC021 indicates that there is a duplication issue within a hierarchy structure. Specifically, it means that a class (identified by &1) of a certain class type (identified by &2) is duplicated in a specified hierarchy type (identified by &3). This typically occurs in the context of SAP's classification system, where classes are organized into hierarchies for better management and reporting.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that the same class has been assigned multiple times to the same hierarchy level, which is not allowed.
  Data Entry Errors: Manual data entry errors can lead to unintentional duplication of classes in the hierarchy.
  System Migration Issues: If data has been migrated from another system, it may have resulted in duplicate entries that were not properly cleaned up.
  
  Solution:
  
  Check Hierarchy Structure: Review the hierarchy structure for the specified hierarchy type (&3) to identify where the duplication is occurring. You can do this by navigating to the relevant transaction in SAP (e.g., CL02 for class maintenance).
  Remove Duplicates: Once you identify the duplicate class entries, remove the duplicates from the hierarchy. Ensure that each class is only assigned once to a specific level in the hierarchy.
  Data Validation: Implement data validation checks to prevent future duplicates from being created. This can include setting up validation rules or using batch jobs to regularly check for duplicates.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on managing class hierarchies and avoiding duplication.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01 (Create Class), CL02 (Change Class), and CL03 (Display Class) for managing classes and hierarchies.
  SAP Notes: Check SAP Notes for any known issues or patches related to hierarchy management that may address this error.
  User Authorization: Ensure that you have the necessary authorizations to make changes to class hierarchies, as restrictions may prevent you from resolving the issue.
  
  By following these steps, you should be able to resolve the HPC021 error and maintain a clean and efficient hierarchy structure in your SAP system.