Net tax base and gross tax base is not defined

What causes this issue?

For the company code, it was specified that the net value (amount minus
cash discount) is the tax basis and the gross value (amount including
taxes) is the cash discount base. This constellation is not supported
by the system.

How to fix this error?

Correct the configuration for the company code in question.

Error message extract from SAP system. Copyright SAP SE.