Phase 1 — Enterprise Structure
🎯 In plain words
❓ Why it matters
Every single transaction — a purchase order, a goods receipt, an invoice — references these org units. And the structure is painful to change once it's been used (documents already point to it), so the rule is simple: get it right early. This is also exam-heavy: the assignment T-codes are favourite questions.
🧠 Key concepts you must know
1. The boxes, from big to small
- Company — the top group (consolidation level).
- Company Code — a legal entity with its own books (balance sheet & P&L). The key FI unit.
- Plant — an operational site (factory, warehouse, branch) where you make/store stock.
- Storage Location — the shelves/areas inside a plant where stock physically sits.
2. Who buys — purchasing units
- Purchasing Organisation (POrg) — the unit that negotiates terms and buys from vendors.
- Purchasing Group — the actual buyer (a person or small team) inside the POrg.
3. The valuation level — where stock is valued
Stock value is tracked either at plant level (most common, and standard in S/4HANA) or at company-code level. This is a once-only, system-wide decision because it sets how granular your material valuation is.
4. The assignments — bolting it together
| T-code | Assigns |
|---|---|
| OX18 | Plant → Company Code |
| OX01 | Purchasing Org → Company Code |
| OX17 | Purchasing Org → Plant |
| OMKI | Standard Purchasing Org |
5. Centralized vs decentralized purchasing
A POrg can be tied to one company code (cross-company buying is then restricted), tied to a plant, or set up to buy across the group. Centralized = one POrg buys for many plants/companies (better deals, more control); decentralized = each site buys for itself (more local flexibility).
🛠️ Do it now — practise alongside
Don't just read — build the skeleton in your IDES so the assignments make sense:
Org Structure Setup Hub Plants (3) Assign plant→CC (4) Purch Orgs (8)Create a plant, assign it to your company code with OX18, then link a purchasing org with OX01 and OX17.
🔗 Connects to
- Phase 2 — Company Code & S/4 Config: you'll make the company code actually able to post.
- Phase 3 — Master Data: materials, vendors and info records all sit on this org frame.
- Setup Hub: the full guided build of every org unit and assignment.
🎓 Cert focus & quick recall
C_TS452 area ② (Org levels / cross-functional customizing). Expect questions on what each assignment T-code does and on plant vs storage location vs company code.
What's the difference between a plant and a storage location?
A plant is an operational site (where you make/store stock and where valuation happens); a storage location is a sub-area inside a plant where stock physically sits. One plant has many storage locations.
What does OX18 do?
It assigns a plant to a company code — telling SAP which legal entity owns that operational site.
Plant-specific vs cross-company purchasing organisation?
A POrg can be assigned to a single company code (and optionally a plant) for local buying, or left unassigned to a company code so it can buy across companies — that's centralized/cross-company purchasing.
What is the valuation level?
The level at which material stock is valued — either plant or company code. In S/4HANA it's standard at plant level. It's a system-wide, once-only setting.
✅ You're ready to move on when…
- You can draw the hierarchy Company → Company Code → Plant → Storage Location from memory.
- You can say what OX18, OX01, OX17 and OMKI each assign.
- You can explain the valuation level and centralized vs decentralized purchasing.