Treatment of Exchange Gain/Loss Account (SOFP)

Hi,
The company I am currently working at translates its foreign monetary items at year end and credits fx gain to p&l and debits it to BS and vice versa. After the year end it reverses the journal entry done at the year end which does not make sense to me. I understand it is an unrealised gain/loss that is why it is disclosed separately in the BS. But What should be the treatment of Exchange loss/gain account (BS) after the year end i.e. when the unrealised gain becomes realised.
Much appreciated.