Finding and your answer
Customer.CustomerSegment column
Not found in this gold boundary
99%
How the model read it
The required commercial segment and its illustrative ENT/MID/SMB domain are not present in the observed finance-ledger model. AccountType is not a supported equivalent because it describes accounting accounts rather than customers.
Workbook evidence
Cited current gold
Open questions
Are Enterprise, Mid-market and Small business the complete governed segment domain?
Is segmentation current-state only, or must historical segment changes be analysed?