Entry of building obligations after building permit

I'm starting to understand. You want to build a smaller retaining wall. For that, soil would need to be built up and a building encumbrance registered. You are now concerned that this could affect the existing building permit. Correct? Or have I misunderstood something?

Yes, exactly. That is my concern and question :)

That didn't sound like that in the initial post.

If reason prevails before the construction of an [Eiger Nordwand], I always find that very welcome. But tell me: who is the higher-up, and who wants to build?