If you have sufficient settled funds in one currency and request a withdrawal in a different allowed currency, the AutoFX functionality will allow the withdrawal to proceed by automatically converting the required amount to flatten any resulting negative cash balance.
Example:
If you have GBP 2,000 in settled funds and request a withdrawal of USD 1,000, the withdrawal will be processed. After the withdrawal, an AutoFX transaction will occur to convert the required amount from GBP to USD to settle the transaction and cover the debit.
Additional Information