Limitations to Importing and Exporting Data
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For some setup changes you need to import setup data several times.
For example, you might first need to import an object if other objects depend on it.
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If you cancel an import, the changes that have already been made won't be rolled back.
This is because each object imported is committed individually.
If you need to roll back to an earlier setup, restore the configuration from a backup copy of the database.
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You can't change an attribute property.
For example, you can't change the URN format for an entity.