Order Cancel and Cancel-Replace Requests by ClOrdID is a risk management feature that allows clients to cancel and modify resting orders using FIX tag 11-ClOrdID without providing tag 37-OrderID.

All iLink sessions for futures, options on futures, and EBS Market on CME Globex sessions are enabled for Order Cancel and Cancel/Replace by ClOrdID functionality.

Clients intending to use this feature must complete an AutoCert+ certification before using the functionality.

Rejects for ClOrdID (tag 11) Uniqueness

To support order cancellation and order modification by tag 11-CIOrdID, this value must be unique per SenderComp (Session ID + Firm ID) for all working orders on a single market segment.

For an iLink New Order - Single tag 11-ClOrdID:

• CME Globex will reject an order having the same ClOrdID and SenderComp as a currently working order on the given market segment. A duplicate ClOrdID will generate an iLink Business Reject (tag 35-MsgType=j) message with tag 380-BusinessRejectReason = 133 and tag 58-Text = Duplicate ClOrdID: X not allowed.

A ClOrdID value can be re-used on the same Market Segment only when the prior order is no longer resting, for instance:

• the prior order has been completely filled, or

• the prior order has been cancelled, or

• the prior order has been eliminated.

Processing for ClOrdID and OrderID Values

Effective with iLink schema v8, FIX tag 37-OrderID is an optional tag in iLink Order Cancel Request and iLink Order Cancel Replace Request messages for CME Group Futures and Options on Futures markets.

• If an Order Cancel Request or Order Cancel Replace Request contains both CIOrdID and OrderID, then the OrderID will be used to look up the original order.

• If a ClOrdID in an Order Cancel Request or Order Cancel/Replace Request is changed from what was in the original order,

  • the client should send an Order Cancel Request or Order Cancel/Replace Request with the latest CIOrdID accepted by CME Globex.

  • the client sending an Order Cancel Request or Order Cancel/Replace Request with the previous CIOrdID must provide an OrderID as well; otherwise, the Order Cancel/Replace Request will be rejected as order not found.

• An iLink Execution Report - Cancel and iLink Execution Report - Modify message will return both ClOrdID and OrderID values.

• An iLink Order Cancel Reject and iLink Order Cancel Replace Reject message will return both ClOrdID and OrderID values.