# Cutover Plan — Wave 1 (BeNeLux)

**Project:** NWRG-S4-2026
**Wave:** Wave 1 — Netherlands, Belgium, Luxembourg (87 stores)
**Cutover window:** 09 Jul 2027 (Sat) 18:00 CEST – 12 Jul 2027 (Mon) 06:00 CEST
**Cutover manager:** Anika Schroeder
**Authority to proceed (ATP):** Pieter Vandermeer, CFO + Jürgen Holtmann, audit

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## Cutover window

**Total downtime:** 60 hours
**Go-live:** 12 Jul 2027 (Mon) 06:00 CEST — Wave 1 stores reopen on S/4HANA Cloud
**Hypercare start:** 12 Jul 2027 (Mon) 06:00 CEST

## Pre-cutover checklist (T-7 days)

- [x] **T-7** — All UAT defects closed (target: 0 high, 0 medium); current: 0 high, 2 medium (both deferred to hypercare with sign-off)
- [x] **T-7** — Final data migration dry-run completed, reconciliation report green
- [x] **T-7** — Steering committee Go/No-Go #1 (held 02 Jul, decision = Go)
- [x] **T-5** — Rollback plan re-rehearsed end-to-end
- [x] **T-3** — All ECC change requests frozen
- [x] **T-2** — Final cutover dress rehearsal (full 60-hour sequence executed in QA)
- [ ] **T-1** — Steering committee Go/No-Go #2 (scheduled 08 Jul 16:00 CEST)
- [ ] **T-0** — ATP issued by CFO + audit at 18:00 CEST

## Cutover sequence

### Phase 1 — Freeze (Sat 18:00 – Sat 20:00)

| Step | Owner | Duration |
|---|---|---|
| Freeze all postings in ECC NL/BE/LU | NW IT (Lukas) | 30 min |
| Final delta export from ECC (transactions since 04 Jul backup) | NW IT | 90 min |
| Notify users — frozen-state confirmation | Change mgmt (Imogen) | 30 min |

### Phase 2 — Migrate (Sat 20:00 – Sun 12:00)

| Step | Owner | Duration |
|---|---|---|
| Load master data (validated in Realize) | DXC + NW IT | 4 h |
| Load open transactional data (open POs, open SOs, open AR/AP) | DXC + NW IT | 6 h |
| Load historical FI archive bridge (5 yrs FI postings, read-only) | NW IT | 4 h |
| Validate row counts and aggregates against export reconciliation | NW IT + audit observer | 2 h |

### Phase 3 — Activate (Sun 12:00 – Sun 22:00)

| Step | Owner | Duration |
|---|---|---|
| Activate S/4 production tenant for NL/BE/LU | DXC | 2 h |
| Activate Coupa-S/4 interface | DXC | 1 h |
| Activate Demantra-S/4 interface | DXC | 1 h |
| Workday consolidation pipe live | Workday team | 2 h |
| Functional smoke tests across MM, SD, FI | UAT team | 4 h |

### Phase 4 — Validate (Sun 22:00 – Mon 04:00)

| Step | Owner | Duration |
|---|---|---|
| Country-level functional sign-off (NL → BE → LU) | Process owners | 4 h |
| End-to-end business process validation (order-to-cash, procure-to-pay) | UAT team | 2 h |

### Phase 5 — Open (Mon 04:00 – Mon 06:00)

| Step | Owner | Duration |
|---|---|---|
| Open S/4 to country-level keyusers | Lukas | 30 min |
| Final Go/No-Go (rollback decision point) | Steering | 30 min |
| Open S/4 to all 87 store users | Lukas | 30 min |
| First transactions live | Stores | 30 min |

## Rollback decision criteria

The Final Go/No-Go (Mon 04:30 CEST) is the last point at which rollback is feasible. Rollback is triggered if **any** of:

- Reconciliation report shows > 0.05 % aggregate row variance vs. export.
- Any country fails functional smoke test more than once.
- Critical interface (Coupa, Demantra, Workday) unable to round-trip a test transaction.
- Steering members lose simple-majority confidence.

Rollback procedure: re-activate ECC NL/BE/LU production, replay the delta export back into ECC, reopen to users. Estimated rollback duration: 8 hours.

## Communications

| Audience | Channel | Owner | When |
|---|---|---|---|
| All NW employees | Email + Slack + Workday banner | Imogen | T-7, T-3, T-0, on-go-live |
| 87 wave-1 store managers | Direct call + video brief | Imogen + country champions | T-7, T-1 |
| External — suppliers (Coupa) | Coupa announcement | Supply chain | T-7 |
| External — customers (B2B accounts) | Direct sales team contact | Sales | T-7 |
| Audit / regulators | Pre-notification of changeover | Jürgen | T-14 |

## Hypercare entry

Effective Mon 06:00 CEST (wave-1 go-live):

- **War room** in Eindhoven HQ + Brussels HQ, staffed 06:00–24:00 CEST for 14 days.
- **Hypercare ticket priority** — P0 < 15 min response; P1 < 1 h; P2 < 4 h.
- **Daily war-room sync** at 09:00 CEST with full project team.
- **Steering committee** stand-up every other day at 17:00 CEST until 26 Jul 2027.

Hypercare exit gate: 14 days of green KPIs (close cycle time, order-to-cash error rate, replenishment auto-approval rate) **OR** 30 days elapsed (hard limit). See `04-hypercare-exit-report.md` (issued at hypercare exit).