A disbursement to a foreign vendor is recorded like a disbursement from a domestic vendor. The difference is that when a vendor has a primary currency that is different from your company's base currency, the vendor's currency and the current exchange rate are displayed in the top left corner of the screen, and the Currency Exchange ($) hot key is displayed in the top right corner of the screen.
To disburse payments in a foreign currency, follow the Posting Payables procedure and then use the Currency Exchange ($) hot key.
See Also:
Viewing Currency Exchange Information
Buying and Selling in Foreign Currencies Overview