Message type: E = Error
Message class:  KZ - Cost Object Repetitive Mfg / Process Mfg 
Message number: 020
Message text: CO area of higher-level cost object transferred
You have not specified a controlling area, so the system uses the
controlling area of the higher-level <DS:GLOS.cost_object_ID>cost
object ID</>.
All <DS:GLOS.cost_object_node>cost object nodes</> in a
<DS:GLOS.cost_object_hierarchy>cost object hierarchy</> must belong to
the same controlling area.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message KZ020, which states "CO area of higher-level cost object transferred," typically occurs in the context of controlling (CO) when there is an inconsistency in the cost object hierarchy or when trying to post costs to a cost object that is not properly linked to the controlling area.
Cause: Inconsistent Cost Object Hierarchy: The cost object you are trying to post to may not be correctly linked to the controlling area of the higher-level cost object. Incorrect Configuration: The configuration of the cost centers, internal orders, or other cost objects may not align with the controlling area settings. Posting to a Different Controlling Area: Attempting to post costs to a cost object that belongs to a different controlling area than the one currently being used in the transaction. Missing Master Data: The master data for the cost object may not be set up correctly, leading to this error.
Solution: Check Cost Object Hierarchy: Verify
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