You may withdraw up to the positive settled cash balance that you hold in the specific currency that you are withdrawing. If your balance in that currency is zero or negative, you cannot withdraw any amount in that currency, even if other currencies in your account have positive balances.
Example:
If your account holds the following balances:
- USD = 1,000
- GBP = 0
- SGD = 3,000
You could withdraw up to USD 1,000 and up to SGD 3,000, but you could not withdraw any GBP, since your GBP balance is 0.