أضيفت إلى بعض المبادئ التوجيهية في دليل الممارسة بنود نموذجية يمكن أن يتيح اعتمادها مزايا في ظروف معينة.
“It has sometimes been contended that when a reservation has been accepted by another State it may not be withdrawn without the latter's consent, as the acceptance of the reservation establishes a regime between the two States which cannot be changed without the agreement of both.