Inventory Write Down process

Hello, Rakesh,
Talking about inventory write-down process, what do you mean? Pure financial provision entry (without impact on inventory subledger) or inventory revaluation process?
In the second case, inventory revaluation creates a specific business events in IFS: INVREVAL+, INVREVAL-, using M8 and M9 posting types

Hello, Rakesh,
I am sorry, but I am not sure if I can provide more details. You should speak with an expert in distribution or manufacturing area. In Financials, we deal usually with result of the process, i.e. posting types. 
Details of solution could depend on the way inventory valuation is set in the system (method principle, like FIFO or Standard costs, and valuation level, like part no, lot batch no, serial no, condition code).

If I remember well, applying specific condition code to inventory item can result in change of its value, which could be similar to write-off codes applicable to AP/AR ledger items. AP and AR processes I am familiar with, details of inventory solutions are outside my competence area.