1. Master data audit
Validation failures trace back to fields. Audit the three master lists that appear on every invoice and fix exceptions in the master record once, not on each document.
What this phase owes you
- Customer list: registration name, tax identification number, address, contact
- Product and service list: description, unit of measure, tax code, price basis
- Supplier list for purchases, including foreign suppliers where applicable
- Duplicate and inactive records cleaned up before migration