How to fix SAP error KI203?

What causes this issue? You created data in company &v1& and simultaneously entered controlling area &V2&, or the controlling area was determined automatically and transferred to cost accounting. In your organization, company code &V1& is assigned to controlling area &V3&, not &V2&.System Response The SAP System recognizes the incorrect assignment and it is rejected.How to fix this error? If you entered controlling area &V2& youself, simply retype your entry. If this is not the case, there is an error in the program. Note the entries that led to this error message and inform SAP.Error message extract from SAP system. Copyright SAP SE.

How To Fix KI203 - Company code & is not assigned to CO area &

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KI203 - Overview

Message type: E = Error
Message class: KI -
Message number: 203
Message text: Company code & is not assigned to CO area &
Show details Hide details
What causes this issue?
You created data in company &v1& and simultaneously entered controlling
area &V2&, or the controlling area was determined automatically and
transferred to cost accounting. In your organization, company code &V1&
is assigned to controlling area &V3&, not &V2&.
System Response
The SAP System recognizes the incorrect assignment and it is rejected.
How to fix this error?
If you entered controlling area &V2& youself, simply retype your entry.
If this is not the case, there is an error in the program. Note the
entries that led to this error message and inform SAP.

Error message extract from SAP system. Copyright SAP SE.

KI203 - Details

Error Code: KI203
Error Message: Company code & is not assigned to CO area &

Summary
This error indicates that the specified company code is not linked to the controlling (CO) area in SAP. Without this assignment, controlling transactions and cost accounting processes cannot be executed properly for that company code.

Root Causes
The company code has not been assigned to any controlling area in the system configuration.
Incorrect or missing master data setup where the controlling area assignment was overlooked.
User attempts to post or process controlling documents for a company code that lacks CO area linkage.
Transport or system copy issues where configuration changes were not properly moved or activated.
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