When merchants, or a merchant and a person that is not a merchant, have regular dealings, an open account becomes effective by virtue of their agreeing to set off the total amounts of claims and obligations arising from their dealings during a fixed period of time and to pay the balance.
交互計算は、商人間又は商人と商人でない者との間で平常取引をする場合において、一定の期間内の取引から生ずる債権及び債務の総額について相殺をし、その残額の支払をすることを約することによって、その効力を生ずる。
merchant
「商人」
A person who, in their own name, carries on commercial transactions (商行為) as a business.
Defined inArticle 4, paragraph (1)· applies throughout the law