This is a function to cancel all eligible orders at once by a mass cancellation order. The conditions of use are as follows;

Target user : Users who have Virtual Servers on that the STP account is configured.

How to use : Place the mass cancellation order that specifies the issue code, side, price, and trigger unit (STP account or Virtual Server).

Target order : Orders that meet following conditions are cancelled.
1. placed from the Virtual Server that has the same STP account number as the Virtual Server that sent the mass cancellation order (or from the same Virtual Server)
2. The orders that prioritize over the specified price of the issue (including the specified price)
- not cancel orders that are inferior to the specified price or on the opposite side (sell/buy).
- In case of specifying STP account as trigger unit, orders placed across the trading participants are cancelled.

Notice : Send the invalidation result notice to the Virtual Server which placed new order
- newly add the reason code for the invalidation by mass cancellation order.
Send the mass cancellation completion notice to the Virtual Server which placed mass cancellation order.

Transaction : No other orders or executions are interrupted during the mass cancellation process as it is processed in a single transaction.