When drawings are exported as a PDF then it gets added as dataset under item revision with relation 'Manifestations'.
What is your purpose? As in structure manager you can see only item revisions (BOM Line), no datasets.
Testing: NX 11 | NX 12 | TCIN
TC 11.2 | TC Vis 11.3 | AWC 3.2
I would like to see the name of the dataset like I can see it in properties of the item revision.
The purpose is to quickly know what item revisions doesnt have a pdf dataset so we still need to print the drawing.