Hi whiskeytango
Yes, you can play with the PO statuses and the inbound stock.
In ATUM free, when any PO status is changed to "completed", the stock is added automatically and the inbound stock reduced (it isn't expected anymore for that PO).
In Purchase Orders PRO, the status changes don't affect the inbound stock at all. Only when you add deliveries and add the items to stock, the inbound stock is affected.
Best Regards,
Salva.