Comment 34 for bug 610738

I will put this bug to invalid. Weighted average cost does not change when returning products in the normal case. Weighted average cost is based on purchases and starting inventory and not on returns. (and I do not say there can not be any exceptions or that it won't be handled when developing FIFO modules, ...)

Just for reference:

http://www.accounting-basics-for-students.com/fifo-method.html
http://en.wikipedia.org/wiki/Average_cost_method#Weighted_Average_Cost