Currency Master enables your firm to operate in a corporate (base) currency and receive (AR) and/or remit (AP, Purchasing) funds in a currency of original entry. Entries should only be made for the currency (or currencies) of original entry, not for the corporate (base) currency.
With the exception of GL, all money fields will post in their currency of initial entry. For example, assume your firm uses Canadian currency as the coporate currency. With multinational currency enabled, you can pay a Vendor based the US in US Dollars; US dollars will appear on the check and be posted to AP.