Subsequent agreement and subsequent practice are not only pertinent for ordinary inter-State treaties, but also for those treaties that are constituent instruments of an international organization (art.
18. 嗣后协定和嗣后实践不仅涉及国家之间的普通条约，也涉及作为国际组织组织法的条约(《维也纳条约法公约》第5条)。