How do I distinguish between a cancellation request made in the Return/Cancellation Request List Query API and an order that was canceled after the delivery order?

Items that are requested to be returned (cancelled) while in preparation for a product can be viewed in the status of RU (Request to suspend shipment) when querying the API for return/cancellation request list query.

In the case of inquiry in the condition of returning to UC (Return request received), all items requested for return (cancellation) after the status of product preparation and delivery order can be viewed.

In other words, returned items requested during product preparation are inquired with the same data in both the RU state and the UC state.