You should be able to edit the line item and update it with the correct amount.
Then exit out to a different tab, and return, and it should look something like this:
My local currency is Australian Dollars (AUD) but I have to pay a bill monthly in United States Dollars (USD).
Since it got the conversion wrong, I had to edit it and update it to say the amount that my bank recorded in internet banking (AUD 32.67 = USD 25.00) for that transaction.
Currency is constantly fluctuating, so from what I understand we need to always update it to show the correct amount because Manager does not know at what rate we were charged.
In settings, we can set default rates - but again, since it is constantly fluctuating, this would only act as a default and normally I’d expect would still need to edit it once you’ve checked your bank and know how much you were charged (or how much you were paid - in your case).
Under settings, set default: