To check the item flexfield value,
1 you need to define the item flexfield as "Indenpendent" value set.
2. If you set up the item's value set with "None" validation, then system will not capture those value in a separate table. Instead, you need to find from the mtl table.
3. when go to
Inventory>set up>flexfield>key:values
you need to enter the application name as "Oracle Inventory"