Hello!

I have an issue to solve and I hope someone of you can help me.
I'd like to modify the foundation slab boundary, where I placed also a slab edge. If I try to edit the slab sketch and modify the original boundary, Revit gets me an error message "Could not create Slab Edge" and it suggests to delete the elements.
The problem is, that I have already drawn the reinforcement for the hole project and I don't want to lost all the work already done.

Have you any suggestion how to solve this issue?