Identifying corresponding MRP Items give an order

Hello everyone,

I request assistance with linking SAP tables for my stamping operation.
Specifically, I privation to execute the following:

• If an bid is simply a primary, I privation to get each MRP-generated items corresponding to this superior demand.
• If an bid is simply a secondary (SekBed), I privation to place its corresponding superior demand.

I would beryllium thankful for immoderate advice!