How To Fix KZ056 - Cost object & is already marked as top node of hierarchy (*)

KZ056 - Overview

• Message type: E = Error

• Message class: KZ - Cost Object Repetitive Mfg / Process Mfg

• Message number: 056

• Message text: Cost object & is already marked as top node of hierarchy (*)

What causes this issue?

The cost object ID is already defined as the highest level in
the cost object hierarchy when '*' was entered in the "Higher-level
cost object" field.

Error message extract from SAP system. Copyright SAP SE.

KZ056 - Details

• The SAP error message KZ056 indicates that a cost object (such as a cost center, internal order, or project) is already marked as the top node of a hierarchy. This typically occurs in the context of controlling (CO) modules when you are trying to assign a cost object to a hierarchy that already has a designated top node.
  
  Cause:
  
  Duplicate Assignment: The cost object you are trying to assign is already set as the top node in another hierarchy.
  Hierarchy Structure: The structure of the hierarchy does not allow for multiple top nodes. Each hierarchy can only have one top node.
  Incorrect Configuration: There may be a configuration issue in the hierarchy settings that is causing this error.
  
  
  Solution:
  
  Check Existing Hierarchies: Review the existing hierarchies to see if the cost object is already assigned as a top node. You can do this by navigating to the hierarchy management in the SAP CO module.
  Change Top Node: