Hi,

Lets take my scenario as below :- 

I purchased a perfume ABC on 1 August 2021 at a price of 10 USD and entered it in my item list. 

10 days later, I purchased the same item from the supplier at the price of 12 USD. 

Suppose I sell the product at the rate of 11 USD thinking I made a profit, I am actually making profit of 1 USD in the first product but losing in the second one. 

There is a difference in price when I make the invoice now. 

Can you help me sort this issue out?