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This page explains why Material Ledger must be explicitly activated and price determination defined for consultants, architects, and anyone responsible for stock valuation in S/4HANA. In short, activation tells SAP to start valuing materials in real time, and price determination defines how those values are calculated. It matters because valuation logic cannot be ambiguous once stock starts moving. Use it when a plant holds valuated inventory, and avoid it only when the plant never carries stock.
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Up to this point, Material Ledger has been theoretical.
Currencies are defined.
Rules are assigned.
But nothing is live.
Activation is the moment SAP stops preparing and starts enforcing. By activating Material Ledger at plant level, you tell SAP that every goods movement must now carry valuation consequences. At the same time, price determination locks in how SAP calculates those values. Together, these two decisions switch valuation from design mode into operational reality.
Once this step is completed, SAP is no longer tolerant of uncertainty.
Material Ledger activation means SAP will actively value every stock movement using Material Ledger logic.
Price determination defines how SAP calculates material prices.
Transaction-based price determination (2) means SAP captures actual costs as they occur, instead of correcting them later in a periodic settlement.
In plain English: activation turns valuation on, and price determination decides whether SAP reacts in real time or fixes things afterwards.
From the first goods receipt onward, SAP needs a single, unambiguous valuation model. Because stock movements immediately affect financial reporting, SAP requires both activation and price determination to be defined before any material can move.
As a result, all goods receipts, goods issues, transfers, and production postings follow the same valuation logic. There is no switching later without serious consequences. This is why SAP forces this decision before the system goes live.