If you don't have production structure in APO (BOM, PDS, etc.) you should not use Optimizer. You can use Location heuristic. Is fastest and more easier to understand the results than Optimizer.
Isn't this a generic question? What we need to understand is; what's the purpose of the same? Will it be demand driven from parent product or you will just forecast raw materials? If not from parent product, then are you planning raw materials in DP or some other forecasting tool?
We will just forecast Raw materials so that we can have a rough estimate how much qty of raw material is needed for say producing 200 MT of finished goods in mill industry
As you have mentioned that you need rough estimate against the forecast (of finished goods) this means you will forecast finished good and then trigger supplies. So logically it would be finished good being forecast which will generate a plan for raw material on various constraints.
It's the same case we have with strategy 50 (planning without assembly) but this is correctly performed by PPDS heuristic (check SAP note 519070).
One way to handle this situation is through "forecasting with BOM" where user can see a high level plan for the components. You can check below link for the same. but this will not consider any constraints.
Other way could be to create an in-active version, where you copy the data from active version before run. Release your forecast of finished good to inactive version and carry out SNP optimizer run. This will consider all constraints at header and component level. Thereafter generated dependent demand/supplies could be used as rough cut plan for supplier.
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