We have this OpenERP instance with average costing for all products.  But according to this screenshot, its not averaging correctly:

This is a jasper report in excel but the cost in the system itself is also incorrect.

As you can see the total cost is 242,091 (not 250,583) divided by 63 units is 3842.  But th system shows a cost of 3897 for the next sale.  That is incorrect and should be 3842.