Can I exercise warrants for cash if I do not have available funds?

No. In order to exercise warrants for cash the account must hold sufficient funds available for withdrawal to pay the full cost of the warrant exercise.

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Why is my order rejected with a notification stating that funds are not fully available for withdrawal, despite having funds in my account and activated trading permissions?
Is it possible to get a warning when overdrawing a particular currency?
Can I always select between cashless and for cash on the warrant exercise?