The attached pdf says "ST6" so it may be a little out of date. Someone may have something newer.
That's the kind of thing I'm looking for but is doesn't have the icon I'm seeing. I think it indicates a synchronous hole is aligned with a feature on another part.
I wouldn't think that would be a persistent relationship. Plus shouldn't it just show in "Relationships"?
search SE help for "Legend" this is used when SE help shows icons and meaning.
can you screen shot your icon in question ...
Right click on the hole in Path Finder and select "Show Feature Origin".
Now edit the hole by clicking the Edit definition handle(the leader).
While still in the edit mode, right-click on the big blue arrow and select "Position Feature".
Select the plane the hole origin shold be on.