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Inventory every dependency
Catalogue custom and third-party modules, scheduled actions, reports, external APIs and deployment assumptions. Hidden dependencies create the most expensive migration surprises.
Define reconciliation
Accounting balances, open items, stock quantities, valuation, attachments and user access need named validation owners and repeatable checks.
Rehearse the cutover
A realistic rehearsal measures downtime, exposes manual steps and validates rollback points. The production plan should be an improved version of a process already tested.