Example: An issued invoice (FAV) created in December, with payment received to the bank in January.
This issue occurs when a document is in a different currency than the payment.
Error: No exchange rate entered for currency CZK valid as of 31.12.2019
Solution: Tools – Currencies – For currency CZK, enter the exchange rate for 31.12.2019 as 1 to 1 (entering the rate this way will not affect anything, but it will allow the program to match the payment with the invoice)