I have a product raw the base unit of measurement is kg and we create a bom the finish product have a base uom is kg and creat a by_product also have a base uom is kg.

For example we create a bom have a 1 kg raw and cost have 1000 and finish product create is 980 gram and by_product create is 20 gram and cost share 20% like 200 and finish product cost is 800 . 

Butt the finish product cost is not show correct on product like show 832 

And journal entry create that 800 it's good and Inventory valuation is 800 show it's also good 

Butt on the product cost is not show correct there will be show 832 finish product butt by_product is good 👍

How to handle this point please guide me