From SAP IS-U to S/4HANA Utilities: Meter-to-Cash Transition and Billing Regression Testing

Keep this: job aid

Parallel-run comparison with tolerances (billing edition)

• Freeze inputs: same reads, master data and rates in source and target.
• Use simulation (EA00 simulation, EA39 mass simulation) so runs can be repeated without consuming orders.
• Agree tolerances per level before the first mock: quantities and taxes exact; totals within agreed cents.
• Cover every rate category and every logic-changing situation: move-in/out, estimates, proration, budget billing, device changes.
• Triage: quantities, then prices and operands, then invoicing, tax and print.
• Classify every difference: defect, intended change, legacy exception, rounding. Nothing unclassified at exit.
• Keep golden bills per rate category, calculated independently.
• FI-CA: reconcile open items before/after and FI-CA to G/L after FPG1.
• Cutover: plan each billing portion, queue reads and payments, rehearse the catch-up.
• Go-live: golden bills in production plus next-portion simulation versus dress rehearsal profile; hypercare for one full cycle.