Central Finance: Replicating ECC and Non-SAP Postings into S/4HANA and Reconciling the Result

Keep this: job aid

Central Finance reconciliation and readiness card

• Fit check: many long-lived ERPs plus urgent need for one ledger; otherwise compare with a conversion.
• Initial load order: master data, cost objects, WBS, FI/CO postings, CO internal postings.
• Errors: SLT monitoring for replication; AIF (/AIF/IFMON, /AIF/ERR, namespace /FINCF) for posting.
• Fix the cause, restart the message; editing message data is restricted and logged.
• Mapping: key mapping for master data, value mapping for code lists; per source system.
• Use mapping obligatory where a wrong value matters; mapping if possible hides gaps.
• Reconcile counts (FINS_CFIN_DFV_FI_NUM), then balances through mappings, then business review.
• Classify differences: AIF errors, many-to-one mappings, derivation, load granularity, exclusions.
• Central Payments: per source and company code, one-way; reconcile and clear historical open items first.
• Before activation: source payment runs locked, bank files tested, tax reporting proven centrally.