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A person that has paid money or delivered anything as performance of an obligation may not demand the return of the money paid or thing delivered if the person knew, at the time, that the obligation did not exist.
債務の弁済として給付をした者は、その時において債務の存在しないことを知っていたときは、その給付したものの返還を請求することができない。
This names a provision as it read when this amending Act was made. It may have been amended since, so today's text can say something else. That is why it is not a link.This names a law that is not in this collection, so there is nothing here to open.We could not tell which provision this names, so it is not a link.