Hunting a unit reference

[PeterBelow 250]

20 hours ago, Clément said:

The unit I'm tracking does not appear in the graph.

If I remove the path or rename the unit the project doesn't compile.

I deleted all dcus from the library root to be sure only valid ".pas" files are compiled.

But the compiler error message should pinpoint the uses clause the  (now missing) unit appears in, no?