Hi Fong,

We are using 8.1D (11.03.16) and I looked up a Credit Note that we issued yesterday. The credit note was for 1 item from a previous Invoice where 6 of the item was purchased. The Credit calculated the cost correctly, for 1 item. I checked our Inventory account in Ledger as well and it is also correct. I tried a new credit and when I changed the quantity, the extended cost also changed to the new correct amount for that quantity.