weighted average

Hi All,

I have problem to find the weighted average costing for a item.

i have an inventory opening cost is postive on Jan. There is some transfer order transcation, till end of sept.

During sept closing, just found the inventory opening costing (positive qty) turn to negative value  & system not allow closing.

Then we have temporay solution by marking off the negative value to pass the closing.

when enter & check the item, the costing for jan change to positive again.

from account prospect, what will happen for that item sept costing?

will weighted average costing reevaluate the cost from jan transcation?