How To Fix HPC028 - Class &1 of class type &2 is already used in hierarchy type &3

SAP Error Message - Details

• Message type: E = Error

• Message class: HPC - Classification-Based Product Hierarchy

• Message number: 028

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

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message HPC028 - Class &1 of class type &2 is already used in hierarchy type &3 ?

  The SAP error message HPC028 indicates that a specific class (denoted as &1) of a certain class type (denoted as &2) is already being used in a hierarchy of a particular hierarchy type (denoted as &3). This error typically arises in the context of SAP's classification system, particularly when dealing with hierarchical structures in classification.
  Cause:
  
  Duplicate Usage: The class you are trying to assign to a hierarchy is already assigned to another hierarchy of the same type. SAP does not allow the same class to be used in multiple hierarchies of the same type simultaneously.
  Hierarchy Structure: The structure of the hierarchy may not allow for the same class to be reused, which is a design choice in SAP to maintain data integrity and avoid confusion in classification.
  
  Solution:
  
  Check Existing Hierarchies: Review the existing hierarchies of the specified type to see where the class is already being used. You can do this by navigating to the relevant transaction codes (like CL02 for class maintenance) and checking the hierarchy assignments.
  Remove from Other Hierarchies: If you need to use the class in a new hierarchy, you may need to remove it from the existing hierarchy where it is currently assigned. This can be done through the class maintenance transaction.
  Create a New Class: If the class needs to be used in multiple hierarchies and cannot be removed from the existing one, consider creating a new class that can be used in the new hierarchy.
  Consult Documentation: Refer to SAP documentation or help resources for more detailed guidance on managing classes and hierarchies.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01 (Create Class), CL02 (Change Class), CL03 (Display Class), and CL30 (Hierarchy Maintenance).
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  User Authorizations: Ensure that you have the necessary authorizations to make changes to classes and hierarchies in the SAP system.
  SAP Community: Engage with the SAP Community or forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the HPC028 error and manage your class and hierarchy assignments effectively.