i first add new supplier with price list but without item price
then add first sales invoice for item 1 with rate 4000
then price item added auto for item 1 than link with price list that link with this supplier
and this worked well as the doc said
then add second sales invoice for item 1 with another rate for item 1 was 500
the system must update the price item to be 500 but still had the same value 4000??!
https://docs.erpnext.com/docs/user/manual/en/supplier#2-3-currency-and-price-list
what is the matter?
i did not understand the statement or
there are some issue in the system or doc ??!