Actually, we did add this feature. It was done after June of 2007, in late 2008. We just didn't call it "Reference Designators". We called it Reference for short. And it is manifested as tab on the Line Item of the BOM. At the Line Item level on a BOM, you will notice five tabs. Notes, Reference, Substitutions, Comments, Costs. Reference is meant to be the place for Component coordinates. You will need to adjust any forms you want this to show up on. For example, if you outsource your PCB's to a board stuffer, you may want to provide them with the BOM print out. That does not include Reference data in the stock report/form.