Inventory Management Preferences are INCORRECTLY calculating Preferred Stock Level and Reorder Point.

We have Inventory Management Preferences in use to auto-calculating our Reorder Points and Preferred Stock Level on inventory items.

Our Inventory Management Preferences have:
Default Lead Time   7 Days  
Default Safety Stock   10 Days  
Default Preferred Stock Level   60 Days  
Order Analysis Interval   3 Months  
Seasonal Analysis Interval   3 Months  
Estimated Demand Change 0.0% 
Transactions to Consider   Orders


Here is the problem... stock levels are not being set back to zero (0) when an item has no activity for over 3 months.

I have items which inventory stock levels were auto-calculated in 2007... no activity since and still they have stock points.