One more thing,
a clearance has up to 4 elements which are not intrinsically linked (unless a link is stated as part of a specific condition) - namely vertical profile, horizontal profile, speed profile, and time constraints. If you change one element, you only change that element in the reclearance, the rest remains the same (unless you have linked it to another element and then it requires restating or amending).
Correct me if I'm wrong, but this is exactly my point. If your clearance contains a clearance limit with a vertical profile requirement at point XYZ and you change only the clearance limit, then the requirement does not change. The vertical profile is linked to XYZ not the clearance limit.
Obviously if the clearance limit changes to either above or below the profile requirement, the restriction becomes null and void. If a route reclearance is given that omits XYZ from the route, then the vertical profile restriction is cancelled because XYZ was the link to the vertical requirement.
My head is going to explode, good night.