Use only categories "A", "K", and "N" in WIP calculation

What causes this issue?

In the valuation method, you chose <DS:GLOS.WIP_calculation>WIP
calculation</> as the results analysis type.

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?

For WIP calculation, you can only update costs
(<DS:DE.KATEGORIE>category</> K), settled costs (category A), and costs
not to be included (category N [revenue], for example).

Error message extract from SAP system. Copyright SAP SE.