4- غير أنه يصعب من وجهة نظر فنية الإشارة إلى حالة واحدة قدمت فيها الدولة انفراديا وعدا والتزمت به قانونيا دون توقع المعاملة بالمثل من جانب أي دولة أخرى.
From a practitioner's point of view however, it was difficult to recall a single case in which a State had unilaterally made a promise and had held itself legally bound by it without expecting reciprocity on the part of any other State.