Tax assignment for Fiscalization missing

What causes this issue?

You have used invalid settings for foreign currency valuation.

System Response

Program displays a message informing user about invalid settings and
after confirmation returns user back to the selection screen.

How to fix this error?

If you do not want to valuate documents posted in foreign currencies
simply leave all fields (currency, translation key date and exchange
rate type) empty.
Otherwise make sure you have filled currency, translation key date and
exchange rate type fields in foreign currency valuation section of the
selection screen.

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.