A Query for shortfall quantitiy of components in a Planned Order

Hello,

I'm trying to create a query to report committed quantity, required quantity and shortfall quantity of components for a planned order related to a WBS.

When I run MDVP for a specific planned order I see values in FLMNG field.

But when I check the reservation of that planned order in RESB table FLMNG table is empty while other fields for required quantity and committed quantity are filled.

So I ran ST05 for MDVP and figured out that system is using a table called RESVDB( I cannot remember the exact table name) but result the is same.

Does system fill the FLMNG field only in the structure of MDVP with substraction of committed and required quantities and never updates it in reservation tables? If it does update tables where can I find this field?

And also, to get the same result with MDVP, is using these fields in RESVDB the right way?

Thanks,

Arda