Follow these steps when you need to reverse a foreign bank revaluation. 

1. Select Bank accounts on the left. 
2. Double-click on the bank account to open it.
3. On the left select Revaluations.
4. Highlight the revaluation you'd like to reverse and select Show Balances.
5. The option to press Reverse will now show and once you select Reverse, the valuation will disappear.
6. Press Save.