Industry Members are not required to report an Order Modification Request or Order Cancel Request event to CAT to the extent the order is terminal at the time of the request (i.e., the order has already been fully executed or cancelled) in Phase 2d. This activity may be required in future phases of CAT. 

However, starting in Phase 2d, Industry Members must report a Route Modified (MEMR) or Route Cancelled (MECR) event if the Industry Member modifies or cancels a route. If the route modification or cancellation is rejected by the destination venue, the Industry Member must also populate the routeRejectedFlag with ‘true’. The Industry Member may alternatively report a Route Modified Supplement (MEMRS) or Route Cancelled Supplement (MECRS) event with the routeRejectedFlag populated with ‘true’.

Additionally, if a modification or cancellation request was received that was too late to modify/cancel, and the order was not terminal (e.g., the order was “in-flight” and the sending Industry Member did not receive a modification/cancellation confirmation), the request must be reported as an Order Modification/Cancellation Request event.