This topic describes CME STP FIXML trade messaging, cancel and correction functionality and their correlation to iLink order entry message for BrokerTec markets.

Top Day trade cancel and corrections follow one of two models in CME STP messages.

• Cancel Model - A Trade Capture report indicating that a trade being cancelled will be sent.

• Offset Model - Two Trade Capture reports will be sent, one indicating replacement and another for the offsetting (opposite side).

Cancel Model

The following examples illustrate Cancel Model processes, including message sequence and key Trade Capture fields.

Full Trade Cancel

In this example, the passive participant XYZ requests a trade cancel from the GCC.

Partial Trade Cancel

In this example, the passive participant XYZ requests a trade cancel from the GCC leaving the trade between ABC and MNO active after the GCC trade cancel.

Partial Trade Correction

In this example, passive trade XYZ request the GCC to reduce active quantity from 300 to 100.

Trade Price Amend

In this example, XYZ requests trade modification of trade price adjusted from 100 to 99.

Offset Model

The following examples illustrate Offset Model processes, including message sequence and key Trade Capture fields.

Full Trade Cancel

In this example of the offset model, XYZ requests requests a trade cancel from the GCC.

Partial Trade Correction

In this example, XYZ request trade modification from the GCC for quantity 300 to 100.

Trade Price Amend

In this example, XYZ requests trade modification of trade price adjusted from 100 to 99.