When you apply entries in different currencies, there may be a small rounding difference. In this case, you can have the program completely close the entries and post these small rounding differences. To do so, you must specify the interval that you will accept as a rounding difference for the relevant currencies.
Open the Currencies window.
In the Appln. Rounding Precision field, specify the interval that you will accept as a rounding difference for the relevant currency.
Allowing for Application of Customer Ledger Entries in Different Currencies
Setting up G/L Accounts for Rounding Differences