Oracle Inventory provides a variety of windows to view

1. on–hand quantities,
2. reservations,
3. supply/demand,
4. available to promise,
5. supply chain available to promise,
6. and capable to promise information.

The available to promise (ATP) features help you determine when you can commit to fulfilling a customer’s request. The ATP calculation determines the uncommitted portion of your company’s inventory and planned supply. This enables you to determine if a requested item and quantity is available at a specified date.

The supply chain ATP feature provides a global view of material availability for the requested demand. You can view all possible supply sources for an order line, ship set, or configuration.
The capable to promise (CTP) feature lets you determine the availability of resources as well as material.