I tried to modify the data of published items using the updateDraftItem function, but encountered an error stating 'An item with the same ID already exists'. Does this mean that I can't directly modify the data of published items using updateDraftItem? If so, it seems necessary to have an API call that can revert the status of a published item back to draft, but I can't find such a feature. How can I modify the data of currently published items using an API?