How To Fix KU302 - Hierarchy error: First field must be & (CO area)

SAP Error Message - Details

• Message type: E = Error

• Message class: KU - Costing: Rollup

• Message number: 302

• Message text: Hierarchy error: First field must be & (CO area)

What causes this issue?

The hierarchy ID was defined incorrectly in Customizing. The first
hierarchy field must refer to the controlling area.

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?

Go into Customizing and check the structure of the hierarchy.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KU302 - Hierarchy error: First field must be & (CO area) ?

  The SAP error message KU302, which states "Hierarchy error: First field must be & (CO area)," typically occurs in the context of controlling (CO) area hierarchies in SAP. This error indicates that there is an issue with the hierarchy structure being used, specifically that the first field in the hierarchy must be the controlling area.
  Cause:
  
  Incorrect Hierarchy Structure: The hierarchy you are trying to use does not start with the controlling area, which is a requirement in SAP for certain operations.
  Configuration Issues: There may be a misconfiguration in the settings of the hierarchy or the controlling area.
  Data Entry Errors: When entering data, the user may have selected a hierarchy that does not conform to the expected structure.
  
  Solution:
  
  
  Check Hierarchy Configuration:
  
  Go to the configuration settings for the controlling area hierarchy in SAP.
  Ensure that the hierarchy is set up correctly and that the first field is indeed the controlling area.
  
  
  
  Select the Correct Hierarchy:
  
  When performing the operation that triggered the error, ensure that you are selecting a hierarchy that starts with the controlling area.
  If you are unsure which hierarchy to use, consult with your SAP administrator or refer to the documentation for your specific SAP implementation.
  
  
  
  Review Data Entry:
  
  Double-check the data you are entering to ensure that it aligns with the expected hierarchy structure.
  If you are using a custom report or transaction, verify that it is designed to handle the hierarchy correctly.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources related to controlling area hierarchies for additional guidance on proper setup and usage.
  
  
  
  Contact Support:
  
  If the issue persists after checking the above points, consider reaching out to your SAP support team for further assistance. They may be able to provide insights specific to your system configuration.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like OKA0 (for maintaining CO area) or KAH1 (for maintaining cost center hierarchy) to check or modify the hierarchy settings.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  User Roles and Authorizations: Ensure that you have the necessary permissions to view and modify hierarchy settings in the controlling area.
  
  By following these steps, you should be able to resolve the KU302 error and ensure that your hierarchy is correctly configured for use in SAP.