Hi Shan,
This Cube is related to Inventory.The Total stock should match with the MB5B ideally.
If you are not able to relate any query..just create a NEW query agaisnt a Plant/Storage Location for a Particular Material and then Compare the same Quantity in MB5B.
However there is a procedure as to how you load inventory flow only if its followed correctly then only you will be able to match the values.
Rgds
SVU