وفي تلك الحالات قد يلزم السماح لها بالاعتراض على التحفظ رغم عدم اعتراضها على التحفظ الأصلي، لسريانه بشكل موحد على جميع الأطراف المتعاقدة.
The Special Rapporteur also conceded that further analysis was required before being able to ascertain the extent to which the principles embodied in the Convention on the Law of the Non-navigational Uses of International Watercourses were applicable to confined transboundary groundwaters; the same could be said of the elaboration of stricter thresholds in relation to transboundary harm.