Harness SPOOL icon with small box in front in model tree

We are using CREO 7.0.  An associate has a Harness that she is trying to figure out if we have all the spools for.  In the model tree, it shows all the spools, but some have a small box that maybe looks like a small schematic in front of the normal spool model tree icon.  CAN anyone explain what that means?  As you can see, we have other spools that just show the normal spool icon.  The model tree looks like this:

And it is the spool icon in the red box that we are curious about.

thanks in advance!!!!