EP060 – Contingent Order

This proposal defines FIX support for linked or contingent orders. It covers One Cancels the Other, One Triggers the Other and One Updates the Other, including absolute and proportional quantity reduction. Depending on the contingency, execution of one constituent order cancels, activates or reduces the quantity of another.

The proposed model uses New Order List to enter the related orders and List Status to acknowledge or reject the list-level request, while Execution Reports continue to report the state of each individual order. It adds ContingencyType to New Order List and List Status, and ListRejectReason to List Status. Both field numbers remain TBD in this source. Whole-contingency cancellation uses List Cancel Request, while the source discusses individual order changes or cancellation using ordinary order messages subject to bilateral agreement.