ReadonlyactionOptional ReadonlyfieldsOptional Readonlyreturnid of the ReturnItem to update. Either returnItemId or returnItemKey is required.
Optional Readonlyreturnkey of the ReturnItem to update. Either returnItemId or returnItemKey is required.
Optional ReadonlytypeDefines the Type that extends the Return Item with Custom Fields. If absent, any existing Type and Custom Fields are removed from the Return Item.
Sets the Custom Fields fields for the Return Item.