Parallel currencies are assigned to company code &

What causes this issue?

Additional currencies are defined for the company code. With the
exception of the local currency and the transaction currency, Loans
Management does not support additional (parallel) currencies. If you use
parallel currencies the documents are cleared incorrectly in these
currencies. Exchange rate gains and loses from the exchange rates are
not calculated. (Note 380135)

System Response

Customizing error. The system cannot operate.

How to fix this error?

Reset the definition of parallel currencies.

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.