Explain Production Planning (PP): MRP & BOM in SAP

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Production Planning (PP): MRP & BOM

Material Requirements Planning, Bills of Material, and routings that drive production order creation in SAP PP.

Production Planning interviews center on MRP because it's the algorithmic heart of manufacturing logistics - the process that decides what to produce or procure, how much, and by when - and interviewers use it to test whether a candidate understands the calculation logic, not just which transaction runs it.

MRP is like a recipe-scaling assistant for a restaurant chain - given how many meals (finished goods) are ordered or forecast, it automatically works out how much of every ingredient (component) needs to be bought or prepped, accounting for what's already in the pantry (stock) and what's already on order from suppliers (open POs).

Key Concepts

A Bill of Material (BOM, CS01) defines the components and quantities required to produce one unit of a finished or semi-finished material, potentially multi-level (a finished good's BOM contains a semi-finished item that itself has its own BOM), while a routing (CA01) defines the sequence of operations, work centers, and standard times required to actually manufacture it - together, BOM and routing are the master data MRP and costing both depend on. MRP (MD01/MD02, or the newer MRP Live MD01N on S/4HANA for high-performance parallelized processing) nets existing stock and open supply (purchase orders, production orders already in progress) against demand (sales orders, planned independent requirements/forecast, dependent requirements exploded from higher-level BOMs) to generate procurement proposals - planned orders for in-house production, purchase requisitions for externally procured components.

CS01CA01MD01MD02MD01N

The planning strategy (configured per material, e.g., make-to-stock via forecast-based planning versus make-to-order tied directly to a sales order) determines whether MRP plans against a forecast or waits for actual customer demand, a distinction that materially changes inventory risk and lead time exposure and is a favorite whiteboard question for PP consultants to reason through with a candidate. Lot-sizing procedures (fixed lot size, lot-for-lot, period-based like weekly/monthly) determine how MRP batches the net requirement into actual order quantities, balancing setup cost against inventory holding cost.

A senior-level answer connects planned orders converting into production orders (CO01/via MRP conversion) which then consume components (backflushing or manual goods issue) and confirm operations, ultimately generating a goods receipt that closes the manufacturing loop, and mentions that in S/4HANA, MRP Live consolidates what used to be several separate background steps into one HANA-optimized run, dramatically reducing planning run time for large BOM structures.

CO01