Quote Update Acknowledgment Message Fields

Quote Update Acknowledgment messages are sent in response to a Quote Update message. The effect of each requested update will be found in this response. The ordering between request and response is preserved.

For quotes which may remove liquidity or which may post and cause additional Matching Engine action to be taken, such as the early termination of an in progress auction, QuoteResult values of D or d will be returned. In these cases, executions, cancellations, or modifications (as needed) will immediately follow as additional messages. PITCH messaging behavior may also change (e.g. Delete+Add rather than standard Order Modified) for these cases to ensure correct sequencing of events.

In some cases, a new OrderID will be assigned for an existing quote. There are currently two situations where this occurs, but others may be added in the future:

1. An order which has received a large number of quote updates over its life will be assigned a new OrderID if receiving an update which would cause a loss in priority.
2. A quote update sent to modify the PostingInstruction will be assigned a new OrderID if there is an existing quote in that symbol on that port and for that EFID.

If using the OrderID in your system or to correlate with an OrderID on PITCH, always be prepared to receive an update on an Quote Update Acknowledgment message.