The AR-A and AR-Q drill down in the shipments screen is not working for us.  The click on the green arrow displays invoice lines but nothing happens when selected.  This happens in both views.

I can get sales order lines, but not "shipped" invoice lines.  It has been so long since I did any grid or drill down massaging that I have forgotten the logic.  
Since the invoice lines choice is already available when the drill down button is clicked, it should be working with out my help, shouldn't it?