Thank you for your post. This is due to the recent migration from the eCBOT to the CME\GLOBEX.
Here is what you could do on the historical ZN data:
- remove ZN from your default instrument list
- assign again ECBOT as additional exchange for the ZN on the instrument manager
- add again the ZN with ECBOT exchange to your default instrument list
- export the historical data you had stored for the ZN on ECBOT
- go back to instrument manager and remove ZN on ECBOT from your default instrument list
- add again ZN on CME to your default instrument list
- import again your historical data. It should make it into ZN for CME

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