Check what is set up for the month end figures and have a look at the Revaluation function as follows;
For the Revaluation functions:
From the Toolbar, click Nominal Ledger.
Select Processing.
Click Currency Provision Accruals
For Month end revaluation rates:
From the Toolbar, click System Admin.
Click Setup.
Click to select Month End Revaluation Rates.
To enable the reporting rates:
From the Toolbar, click System Admin.
Click Setup.
Select Company Details.
On the Miscellaneous tab, set Revaluation Rates to Month End