Lesson 6 of 6
Conversion sign-off
16 min
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At go/no-go 2, Sunday 14:00 of the go-live weekend, Grace's decision group decides whether Contoso runs on SAP S/4HANA on Monday or falls back to ECC. That decision is only as good as the criteria agreed in advance and the evidence collected during the weekend. Design both long before; rehearse both in the dress rehearsal.
Go/no-go criteria
Criteria must be specific, measurable during the weekend and owned. "Finance is OK" is not a criterion; "trial balance, AR, AP, assets and inventory comparisons for 1710 and 1810 at zero difference or explained, signed by Dan" is.
| Area | Criterion | Signed by |
|---|---|---|
| Technical | SUM finished; no open errors; follow-on activities complete; technical smoke checks passed | Sam (Basis lead) |
| Finance | Agreed reconciliations within tolerance; accepted migration errors documented | Dan (finance process owner) |
| Logistics and sales | Stock per plant and open orders reconcile; critical order-to-cash checks pass | The sales process owner (with Maria, the O2C key user) and the logistics owner |
| Custom code and interfaces | Critical interfaces connected and verified; critical custom functions pass smoke tests | Kenji and the integration lead |
| Timeline | Validation done with buffer to Monday 06:00; rollback still possible if needed | Luis (cutover manager) |
| Defects | No open critical defect without an accepted workaround | Priya (test lead) |
Contoso's go/no-go criteria. Each one has a named owner who signs during the weekend.
- Area checksEach owner verifies their criteria with evidence
- Test lead summaryPriya consolidates results, defects and risks
- Cutover managerLuis confirms timeline and rollback position
- Go/no-go meetingGrace chairs the decision group; process owners and IT leads confirm their criteria
- Decision recordedThe decision group decides go, go with conditions or rollback; executives are informed
Rollback is part of the plan
A go/no-go decision is only real if "no-go" is executable. The rollback plan says how Contoso returns to ECC, up to which point in time it is possible, how long it takes, and what happens to anything done in the meantime. Technically, SUM's database migration option keeps the source database unchanged and offers a reset function until a point in the procedure; your plan must say what applies to your actual procedure and environment, confirmed with SAP and Sam. The latest go/no-go time is the last moment when rollback still fits before Monday 06:00.
- Are all go/no-go criteria met?Yes → go · No → next question
- Is every unmet criterion covered by an accepted workaround and owner?Yes → go with conditions, recorded · No → next question
- Is there still time to fix and revalidate before the latest decision point?Yes → fix, revalidate, reconvene · No → no-go: execute rollback
After go, sign-off continues. Agree a short list of hypercare checks for the first business days (first billing run, first payment run, first MRP run, first period-end tasks), with owners and expected results. The conversion is accepted when those pass and the obsolete data cleanup has been approved by finance, not when the system comes back on Monday morning.
What would you do?
At go/no-go 2 on Sunday 14:00, everything is green except one interface to the logistics provider, which fails. A manual workaround (uploading delivery files twice a day) exists and the logistics owner accepts it for one week. Rollback time has not passed. What should the meeting decide?
- Agree specific, measurable, owned go/no-go criteria before the dress rehearsal, and rehearse them.
- Run a clear sign-off chain from area owners to the test lead, cutover manager and Grace's go/no-go decision group.
- Rollback must be executable, with a known latest decision point.
- Record conditions and continue sign-off through hypercare and the first business cycles.
Check your understanding · not graded
Lesson check
1. Which is a well-formed go/no-go criterion?
2. What defines the latest go/no-go decision time?
3. When is the conversion fully accepted?