The image above shows that when an item on the order is highlighted, it shows the status of it in inventory.
Available – This is the onhand quantity minus the committed quantity.
On Hand – This is the amount that is in stock and includes inventory that has been committed.
Committed – Is the quantity that is in on sales orders, production orders and inventory adjustments/transfer that are in transit
Back Order – Quantity that is is back ordered on a sales order
On Order – The quantity that is on an issued purchase order and not yet received.
Expected – The due date of the last PO created for this item