[Translation from English to Japanese ] you have to deduct this amount of 881＄, by your self, from next payment, just...

you have to deduct this amount of 881＄, by your self, from next payment, just pay with this amount less
As unfortunately, in our country is not correct to do this, considering the accounting laws.
This amount of 881.6 euro, which is in surplus is considered as an advance, and you have to pay just the difference

次回の支払いから、あなたはあなた自身で881ドルを引かなくてはなりません。この金額を差し引いて支払ってください。
残念ながら会計の法律を考慮すると、私の国ではこれに対応することは不正になります。
この881.6ユーロ、過剰分は前払いとみなし、（次回は）差額だけ支払ってください。