return in landed cost inventory org will be apply

create a po for an item x with price 100 usd for qty 1

create a shipment for 10 usd per item

do a receipt

match the invoice with actual cost 10

the average cost now is 110

I  need to do a return

1 how can I do that?

2 - what will be the cost again after return

3 - the actual cost will be removed from the cost of the item