How to change cost price of received items? v8
I created a purchase order with a supplier sprices that were relevant at that time. I received the items each piece of item having it's own serial number (Lot). I sold some of the items and I reported sold items to supplier and get an purchase invoice for them. But now supplier changed it's price for those items I haven't sold yet. How can I change the cost price of these unsold items I received earlier tohether with other items? I use real time costing with FIFO for those items.