Sub Inventory is not Populating in manage Reservations and Picks page

Summary:

Actually when we are fetching the Available to reserve value in a report based on Sub Inventory the correct values are not getting fetched in the report. When we checked in the system the issue is due to sub inventory is not getting populated in the reservations screen. Is there any other way to fetch the correct available to reserve value along with sub inventory.
Current logic - Onhand_qty-Reservation_qty-pending_qty

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Version (include the version you are using, if applicable):24C

Code Snippet (add any code snippets that support your topic, if applicable):