How to track the utlisation of raw material given by cusomer

My business scenario is like this,my customer will supply raw material to my company we have to process the material,sell it to same customer.as a result of this we will processing charge per kg of material.The customer need to know how the raw material supplied by him is utlised (finished goods detail & scrap detail)

Thats is the flow from MM TO PP TO SD (MATERIAL FLOW)