Production cost calculation for non discrete manufacturing

There is a problem I am facing in B1.
We are into manufacturing of chemicals, wherein your output is never exactly same as what you have given in Bill of materials or at the time of 'issue to production'. For example, I issue goods for a product X thinking that I will get 10 kgs output, but after actual production, the output may be 9.9 kgs or 10.1 kgs or 9.7 or 10.2 or whatever. The output will be close to expectation, but never exactly same. Now, the problem is, the cost of finished product is calculated at the time of issue, and so irrespective of how much output I get, the cost of producing it per unit remains the same, which is not the right way of doing it. It should calculate based on the output received (ie. total cost of inputs divided by output quantity), so when I get more output, the cost of manufacturing will be less, and vice versa. This is also resulting in incorrect journal entries between raw materials to work in progress (WIP) in 'issue to production' document and WIP to finished product in 'Receipt from production' document.
How do I solve this??

The process is:
1. Write a production order and based on it print the production instructions. (I assume it will be a repetitive process with more then one receipt from production.)
2. When the production of a portion is ends, copy the original order, modify the quantities in it according to the actual component and result quantity, make a receipt from production based on it and close this order.
3. For the next portion repeat the process described in the point 2.
4. When there is no more production based on the original order, you can close it.
(Probably there is no need for any stored procedure. )

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[Rahul]
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Service Server: WEBSMP106
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