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

KU302 - Overview

• 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.

KU302 - Details

• 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