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CFE Order Modification Restriction


Following the CFE migration to Bats, customers have reported that some order modifications have been rejected by the exchange, with the error “EX: A: Too many modifies” in the X_TRADER audit trail.  We have received confirmation from CFE that the Bats technology introduced a restriction on order modifications, with a limit of 1295 modification on a given order.  Because of this, attempts to modify orders will be rejected after reaching this threshold. Traders using automated trading tools should take particular note of this limitation, as they are more likely to reach the threshold.


Moving forward, orders will need to be canceled and a new order will need to be placed when this modification threshold has been reached.  We suggest that you monitor any orders that may hit this threshold to ensure the desired trade specifics are accepted by CFE.


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