The unadjusted forex gains or losses occur due to the fluctuation in exchange rates. As per the Accounting Standard 11 that documents the effects of changes in the Foreign Exchange Rates, a company has to account for the forex gains or losses, which consist of both Realized and Unrealized gains or losses into their final reports.
Click https://help.tallysolutions.com/tally-prime/accounting/multi-currency/#forex-gain-loss-adjustment to learn how to adjust Forex Gain/Loss in TallyPrime.