I posted the same question on gis.stackexchange (link), but I am posting here as well because it might be better.
I am trying to add labels to my linear feature class. Some of my lines are vertical (i.e. I only see a point representing the start or end node of the line, because they have the same XY coordinates but different Z coordinates).
Unfortunately, it seems ArcMap cannot understand where to place the label (e.g. along the line, before the start, etc.) because the line itself is null (i.e. has 0 (zero) shape length).
Is there a way to solve this?
P.S. I am choosing a "random" Place because it seems there's no "ArcGIS Desktop" to choose... At least the same seems to happen in ArcGIS Pro in the 2d (not 3d) as well (see below).