4. Any State that enters an appearance on the merits in a proceeding instituted against it may not thereafter assert that service of process did not comply with the provisions of paragraphs 1 and 3.
4. 任何国家在对其提起的诉讼中就实质问题出庭，其后即不得声称诉讼文书的送达不符合第1款和第3款的规定。