Enter rate / amounts

What causes this issue?

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

System Response

It is not possible to enter a foreign exchange transaction with the
amount and exchange rate entries made.

How to fix this error?

Enter at least the trading amount as purchase or sale and the exchange
rate. Entry of a foreign exchange transaction is also possible by
entering both amounts. The system calculates the resulting exchange rate
here.

Error message extract from SAP system. Copyright SAP SE.