Status of the Purchase Order when the Close Button is Hit

If the purchase order contains Expenses only (Expense-only purchase order), closing the purchase order would result to Fully Billed Status.

If the purchase order contains Items only (Items purchase order), closing the purchase order would result to Closed Status.

If the purchase order contains Expenses and Items, closing the purchase order would result to Closed Status.

There is not much fundamental difference between the two as you could still reopen a closed (Items purchase order) or fully billed purchase order (Expense-only purchase order).