I think you did't read my blog clearly.
Once Delivery(PGR) is done then stock will be reduced .
If you want to track the record of Delivery then go through VL06O as per following sreen shorts.
Click on List Outbound Deliveries.
Enter the Delivery Date
Enter the billing status (A) as mentioned in picture & then Execute(F8) here you will get all the delivery which are due for billing.
You can also check for purticular Customer by entering Orgnization units in (VL06O)
2Option- Go through VF04(Enter the date & execute) hence you can track the record.
If still any query please let me know.
Thanks
Kamlesh