Confirm Data Types
This stage is repeated for each sub-range in the order they were added.
This stage is used to confirm what will be used to uniquely identify data records as they are imported. For each column in the record, you can also control how that data is interpreted, imported, and configured.
Confirm Data Types for Relationship Field Sub-Ranges
In a relationship field’s sub-range, the wizard is likely to suggest a compound key. As this represents the fields on a relationship between elements that are already defined by preceding sub-ranges and will not be used to generate new elements, this is normal.