How To Fix KZ104 - Single object is already assigned to a cost object

KZ104 - Overview

• Message type: E = Error

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

• Message number: 104

• Message text: Single object is already assigned to a cost object

What causes this issue?

The object cannot be assigned to this cost object ID because it is
already assigned to another cost object ID.

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?

Enter another object.

Error message extract from SAP system. Copyright SAP SE.

KZ104 - Details

• The SAP error message KZ104 ("Single object is already assigned to a cost object") typically occurs in the context of cost accounting or controlling when you attempt to assign a cost object (like a cost center, internal order, or project) to a single object (like a material or activity) that is already assigned to another cost object. This can happen in various transactions, such as when trying to allocate costs or when performing planning activities.
  
  Cause:
  
  Duplicate Assignment: The primary cause of this error is that the single object you are trying to assign is already linked to another cost object. SAP does not allow a single object to be assigned to multiple cost objects simultaneously to maintain data integrity.
  Incorrect Configuration: Sometimes, the configuration settings in the controlling module may not allow for the desired assignments.
  Data Entry Errors: There may be a mistake in the data entry process, such as selecting the