These are funds withheld from your account in order to fulfill pending buy orders, or declared, but not yet paid, dividends.
Funds may also be restricted if you elected to participate in corporate actions (e.g. share purchase plans, entitlement offerings).
If you recently deposited funds to your Superhero wallet using BPAY, these funds will be restricted from withdrawal, but you can use the funds to trade at any time. BPAY deposits are restricted for five calendar days. PayID deposits are not restricted by Superhero but you may experience a 24 hour delay before your bank deposits funds to your Superhero wallet.