Product cost collector is only allowed for confirmation from APO

What causes this issue?

The product cost collector has already been used for confirmations from
<SE>Advanced Planner <(>&<)> Optimizer</> (APO). Therefore you cannot
enter any more confirmations for this product cost collector.

System Response

The action is terminated.

How to fix this error?

If you want to confirm the material outside the APO system, create a
new <DS:TRAN.C223>production version</> and a new
<DS:TRAN.KKF6N>product cost collector</>. This is only possible when
the Controlling level of the material is <LS>Production Plant/Planning
Plant/Production Version</>.

Procedure for System Administrators

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.