You can view supply/demand information, and the current and projected available quantities of an item.

Supply/Demand Type: The supply source or demand source type, such as Account number, Purchase order, Sales order, and WIP discrete job.
Identifier: The identifier for the supply source or demand source, such as the purchase order number or work in process discrete job number.
Quantity: The scheduled supply quantity or demand quantity for the item. Demand quantities are displayed as negative numbers.  Supply quantities are displayed as positive numbers.
Available Quantity: The projected on–hand quantity of the item, defined as Current Available plus all future sources of supply and less all future sources of demand