9-minute read · BUSINESS TRANSFORMATION
ERP Data Migration: Clean, Map, Rehearse and Reconcile
Data migration is a business-control exercise, not just a file transfer. A technically successful load can still produce bad opening balances, duplicate customers, broken traceability or unreliable reporting if the business has not defined what correct means.
Use this as a working sequence; validate ownership, evidence and exception handling for your own environment.
1. Assign ownership before extracting data
Name business owners for each domain—customers, suppliers, items, inventory, finance, employees and open transactions. Define which system is authoritative, who can approve cleansing decisions and which records must be retained for legal, operational or audit reasons. Do not let a technical team silently decide business meaning.
2. Profile the source data
Measure completeness, uniqueness, validity, referential integrity, stale records and inconsistent formats. Look for duplicate entities, missing tax or address fields, units-of-measure conflicts, inactive items that still have open transactions, invalid account mappings and mismatched currencies. Separate genuine defects from legitimate business variations.
3. Create explicit mapping rules
For each target field, record the source, transformation rule, default behaviour, validation, owner and unresolved decision. Document code translations, units, time zones, currency precision, status mappings and references between entities. Never use an undocumented default to make a load pass.
4. Run repeated migration rehearsals
A sensible sequence is an early technical trial, a business-validation cycle, a volume/performance rehearsal and a production-like cutover rehearsal. Record load duration, rejected rows, error categories, reconciliation results and manual fixes each time. Re-run the same controls after corrections to ensure that the fix did not introduce a new defect.
5. Reconcile at business level
Agree totals and tolerances before testing. Depending on the domain, compare record counts, control totals, inventory quantities and values, open order balances, receivables/payables ageing, general ledger balances and key relationships. Investigate differences; do not simply increase tolerance to make the dashboard green. Keep evidence of sign-off and unresolved exceptions.
6. Prepare cutover and rollback decisions
Write a timed runbook with owners, prerequisites, freeze windows, final extraction, delta handling, validation checkpoints, go/no-go authority, communication and support coverage. Define rollback triggers and understand whether rollback means returning to the old system, restoring a backup, replaying transactions or operating in a controlled read-only mode. Confirm the practical steps in rehearsal.
7. Protect sensitive information
Use synthetic or masked records where possible for non-production tests. Limit who can export, store or inspect extracts. Agree retention and secure disposal rules for migration files and logs. Test role-based access and confirm that sensitive fields do not leak into error messages, screenshots or support tickets.
Practical readiness checklist
- Business owners and authoritative sources are named.
- Data quality rules and exception owners are documented.
- Mapping and transformation rules are version controlled.
- Rehearsals use realistic volumes and repeatable controls.
- Reconciliation totals and tolerances are approved in advance.
- Cutover, go/no-go, rollback and support are rehearsed.
- Extracts and test copies have approved access and retention.
Further reading and reference sources
The following primary or specialist references provide useful starting points. Confirm current guidance and applicability before making implementation or compliance decisions.
This article is an educational framework, not legal, security, procurement or implementation advice. Examples and checklists are starting points. Validate requirements, current product capabilities, local law and control design with qualified owners.
Turn the guidance into a business decision
Use Janusora’s free assessment to structure the business problem, then use the Navigator and Workbench to record context, evidence, options and validation actions.
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