When displaying the "Where Used" links for a Publication Source in SIM, the Publication Structures in which the Pub Source appear should be displayed. Instead the user must (according to Customer Support):
Go to the Information Page of the dynamic document and create a new tab at the top of the page.
In the Customize menu select Related Objects > Parts to add the Parts table.
See the content holder in this table that links the publication structure node to the document.
Click the View Information icon for this content holder
This will open the Information page where you can see the publication structure nodes in the Where Used table.
This is not very intuitive and down-right annoying for the user.