When a company is enabled for Pre-Trade Portfolio Risk, the Allow override to SPAN margin setting will become available within Company Settings > Settings > Preferences in TT Setup.

This allows the risk service to use values set in the TT Margin table in the unlikely scenario that Pre-Trade Portfolio margin cannot be calculated for a given order or portfolio.

If this setting is not enabled and the risk service is unable to calculate Pre-Trade Portfolio margin for a new order, the reject messages “SPAN calculation error” or “SPAN service is unavailable” will be displayed to the user.

Note The override setting will be applied across the TT Company; it is not possible to opt in or out of the setting for selected users, accounts, or risk groups.

Risk Administrators are reminded to check and ensure the TT Margin table for their company is accurate and up to date as this will be referenced in the event that SPAN margin cannot be calculated.