What checking rule is used when you run V_V2? Has something to do with "Checking rule for updating backorders" (in customizing)? Or is related to t-code OVZ9 (Availability check control) were you assign a checking rule to the availability type and make the setting related to Stocks and In/Outwords movements?
The idea is to take into account also Quality Stocks, Stock Transfer. and to include Purchase Orders when v_v2 is running.
Thanks