What I wrote was about the fact that some element is causing the problem and you need to find it, then delete it and recreate it.
You found the element, or maybe you already knew it was the one that was causing the problem. Then you copy-pasted it, which is also a good solution. When pasting an element into a project, ArchiCAD checks and fixes the element if there is some problem with it. So it achieves the same as deleting and recreating it.
By the way, what exactly was the problem with the Wall?
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