If you want to apply an entry in an EMU currency to an entry in another EMU currency, for example DEM to EUR, you must define the currencies as EMU currencies in the program.
For foreign currencies, open the Currencies
window.
Press F3 to create a blank credit memo. Place a check mark in the EMU Currency field for the relevant currency.
To define LCY as an EMU currency, click General Ledger, Setup, General Ledger Setup. Place a check mark in the EMU Currency field.
Allowing for Application of Vendor Ledger Entries in Different Currencies
Applying Vendor Ledger Entries in Different Currencies to One Another