As exchange rates between a base currency and foreign currencies change over time, base-currency values of foreign-currency denominated transactions and accounts also change.
These would result to Currency Revaluation which will be posted at the end of each period. Reversing currency revaluations for unrealized exchange rate gains and losses posted in one period are automatically generated in the next accounting period.
If you wish to modify the class, department, or location on a currency revaluation for unrealized exchange rate gains and losses you can do so only if the Period is still Open. However, the option or button to Edit would be unavailable when editing Currency Revaluation (Reversal of Unrealized Gain/Loss), that is because the reversal carry over the information from its source revaluation.
In these cases, you need to edit the originating currency revaluation in order to edit the Currency Revaluation (Reversal of Unrealized Gain/Loss).
Transaction Number 16 with Internal ID= 24634 is the Originating Currency Revaluation
Notice that it has the Edit Button available.
Transaction Number 17 with Internal ID 24635 is the Currency Revaluation (Reversal of Unrealized Gain/Loss), which is automatically created at the beginning of the next period.
Notice that the Edit button is Unavailable.
Editing the Originating Currency Revaluation carries over to the reversal entry.