iLink - Rejects for Tag 11-ClOrdID Uniqueness

CME Globex will validate iLink orders for tag 11-CIOrdID for uniqueness per SenderComp (Session ID + Firm ID) for all working orders on a single market segment. An order with a duplicate ClOrdID will be rejected with a Business Level Reject (35-MsgType=j) message with tag 380-BusinessRejectReason = 133 – 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.