If you do not have the file you used to create the override for this ASIN, you can remove the override by creating another override for the ASIN. For the new override, Enter the SKU, Currency, and ShipOption, and then enter "0" as the ShippingAmt and Additive as the Type.
After you successfully remove an item's shipping overrides using one of these methods, your regular shipping settings will determine the shipping charges for the item.
これらメソッドの内の一つを使って、一個のアイテムの配送手数料を削除を上手く終了なさった後は、そちらの通常の配送設定が該当アイテムに関する手数料を決定するようになります。