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<@UG9Q7TDSP> your view says "Custom All" does that include Vendors and Employees by any chance? If so, then that external id belongs to a Vendor or other type, and is not a Ghost External ID

I see exactly what you mean, I thought External ID was restricted to an entity type

so Internal ID and External ID of anything (customer, order, vendor, employee, etc) has to be unique in my NetSuite universe?

Entities and transactions are seperate, but within each group internal and external ids are unique