Limit Order Update

Modify the price or quantity of a resting limit order while it remains live on the book. OpenYield acknowledges the update and the order continues without interruption.

• Only price and quantity can be changed. Other order attributes — side, security, and time-in-force — cannot be modified.
• If the new price crosses the spread, the updated order fills immediately against available liquidity.
• Reducing quantity does not affect the order's position in the queue. Changing price reprices the order and moves it to the back of that price level in the order book.

The update is sent as a replace: your request carries a new ClOrdID (11) and the original in OrigClOrdID (41). OpenYield atomically replaces the resting order and acknowledges the change. If the update is rejected — for example because the original order was already filled or canceled — you will receive a rejection instead.