Revaluation of Foreign Currency Bank Account

Hello,

We have a situation with Foreing currency bank account. Our functional currency is EUR and we have a USD denominated bank account. Bank accounts are defined as an Asset account.

Below is an example:

       

Date	Dr	Cr	Currency	Exchaneg rate	Month end rate	Difference	Gain(loss)
01-Apr-18	1000		USD	1.12	1.20	0.08	80
15-Apr-18		500	USD	1.16	1.20	0.04	-1.16
30-Apr-18		500	USD	1.18	1.20	0.02	-1.18
Total	1000	1000				Total	77.66
Balance is Zero

So if you see the balance is USD is zero but based on the Oracle Revaluation, every month we get the loss or gain based on the period end rates.

Is there a way where we can state if the balance is zero for bank account then revaluation should not run.