Thank you for your reply. I use average moving cost and it can't change. this is most popular method for the inventory. the product price is up to each purchase for calculating cost, and the sales price only allows to me enter basic and prefer price(it doesn't change until I want to change). I think may be I set "allow the inventory quantities below zero" this is why sometimes the cost is more higher than sales price (for sure it should lower than sales price). But it is no choice, because the products come to warehouse first then make sales. after couple day I receive the purchase invoices. any one can help me?
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