In the Imported Harness Data dialog box, the browser nodes contain the electrical components and wires imported from AutoCAD Electrical.
- In the Imported Harness Data dialog box. click Filter
and then select Show Issues Only.
Only items with issues display in the dialog box. The items are identified with the Issue icon. 
There are many issues because the Inventor sample assembly does not contain many of the components contained in the AutoCAD Electrical drawing, as reflected in driverseat_from_ace.xml. For many of the RefDes in AutoCAD Electrical, there are no matching RefDes in Inventor. The fact that various components and RefDes are not present means that connecting wires also have issues. Although RefDes are not present, you can successfully complete the exercise. Data can be missing or incomplete in a real-world design process, but it is acceptable for a given point in the workflow.
Scroll to the top of the item list, right-click PJ2, and then select Issue Description.
The issue description describes the problem and offers solutions. Review the information and then close the issue description.
Next, you use functionality on that same context menu to assign the missing RefDes.