Hello Binu,
- In Repair process there will not be change of material code. There will be change of Material code valuation type. This process is called Refurbishment. See this too: Refurbishment.
- Your requirement resembles very usual Production Order (PP) scenario where a Raw material (say a metal blank) having some material code enters the Order (GI) and a Finished material (say a shaft) and some scrap comes out (GR) of the Order with their own material codes. In such case a BOM needs to be created first on the Finished material which has Raw material/s and Scrap material/s as its components and Routing to be configured.
- For further details on Production Order process it will be beneficial if you interact with PP space by posting your query there AND go through related posts such as Production Orders.
Regards
KJogeswaraRao