GL foreign currency revaluation run at 31.03, values calculated properly and posted. Due to accounting rules this transaction is being reversed at 01.04. TB all data ok at 31.03 - with exchange gain / losses and at 01.04 without (reversed). User run foreign currency revaluation again - according to MS description those should be calculated only for accounts where balance was changed or in the case where exchange rate was changed but system calculates them for all account because it sees the calculation is reversed in future. Now TB at 31.03 is wrong - exchange rate gain/losses are presented twice. The idea is to use a date range when checking if next exchange rates should be or should not be calculated; in the example (assuming the balances and exchange rate was not changed) the second attempt should present 0,00 as the calculation is there at 31.03 it is reversed only at 01.04.