Negligence by legal representatives or clerical staff precludes a party from claiming lack of fault for missing deadlines.

The Supreme Court dismissed the appellant's cassation request regarding a missed appeal deadline caused by clerical negligence. The lower courts found that the delay resulted from improper registration of documents by the union's secretariat staff, not the appellant's personal fault. The court ruled that negligence by representatives or office personnel cannot be excused, thereby upholding the denial of the extension request.