Creates an execution order for trading on the limit order books using Smart Order Routing (SOR).

Requirements:

• The parent order must be in the pending_execution or partially_filled state.
• Multiple execution orders can be created for a single order provided that the sum of their open quantities does not exceed the open quantity of the order.

Once submitted, you will receive one of the following events:

• A system_update event with an event_type of execution_order_request that indicates the request was received.
• A system_update event with an event_type of execution_order_reject if the request fails.
• An order_update event with an event_type of execution_order_create if the request succeeds & is pending execution.

All events include the execution_order_id.