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# IBKR APIs | IBKR WebAPI | Web API Reference

Beginning May 1st, all requests to [Place an Order](https://www.interactivebrokers.com/docs/web-api/v1/endpoints/orders/place-order), [Cancel an Order](https://www.interactivebrokers.com/docs/web-api/v1/endpoints/orders/cancel-order), or [Modify an Order](https://www.interactivebrokers.com/docs/web-api/v1/endpoints/orders/modify-order) for US Futures Orders **must** include the [manualIndicator](/campus/ibkr-api-page/cpapi-v1/#place-order:~:text=instead%20of%20conid.-,manualIndicator,-%3A%20boolean.) field.

The Manual Indicator field is used to determine if an order was manual entered or done through an automated tool.

This field is required in order to remain in compliance with [CME Group Rule 536-B](https://www.cmegroup.com/rulebook/files/cme-group-Rule-536-B-Tag1028.pdf).