Accounting-system migration: control the handover, not only the upload

Define the scope

Define scope before extracting data. Decide which entities, periods, ledgers, open items, masters, documents and comparative balances will move. Record what stays in the legacy system and how it will remain accessible. A migration can appear complete while omitting history needed for reporting or audit trails.

Prepare the data

Profile the source data. Look for duplicate masters, inactive accounts, inconsistent tax codes, missing dimensions and unreconciled balances. Cleaning rules should be approved and repeatable; changing data manually during each trial makes the final result difficult to verify.

Map and reconcile the data

Create a mapping register from legacy fields and accounts to the target structure. Assign an owner for every exception. Run trial conversions and reconcile control totals, trial balance, customer and supplier balances, bank accounts, fixed assets and tax records. Investigate differences to root cause rather than posting an unexplained plug.

Test realistic workflows

Test workflows as well as balances. Users need to complete realistic purchase, sale, payment, receipt, journal, close and reporting scenarios with appropriate roles. Integrations, reports and exported data should be tested against agreed acceptance criteria. Tools such as Alteryx can support repeatable preparation and validation; Tableau or Power BI can help inspect reconciliations when controls and definitions are clear.

Plan the cutover and follow-up

The cutover plan should name the freeze window, final extraction, approvals, backup, rollback criteria and post-launch support. Preserve reconciliation evidence and sign-off. Financial statements produced after migration remain subject to the applicable Companies Act and accounting-framework requirements; successful software import alone does not establish reporting compliance.