Check issue raised by Ms. lea Erika Villena of Banana Republic with June 30, 2016 inventory with total_qty of 30K+ and when they generate the July 31, 2016 the items drop from 21k+
The sudden drop of the total qty from June 30 to July 31 is when we run the inventory workback for July 31 what it will do is recompute all transaction back then.
Ms. Rova already discussed this to Sir Ivan