Price control cannot be changed (cost component split exists)

What causes this issue?

Costing is active and has already been carried out for the current
period. You can only change the price control to "Standard" if the
moving average price and the standard price are identical.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.