Asset Import - Warranty Expiry Date

Just checking over a batch of data being imported via CSV and the Warranty Expiry data doesn't appear to be shown on screen so I can't check it.
The import file has fields defined for
Purchase Date
Warranty Expiry Date
Expiry Date

I populated Purchase Date and Warranty Expiry Date and left Expiry Date blank as I wasn't sure why there would be 2 expiry dates, assuming for leasing or similar.

On checking the asset screen there is only purchase date and expiry date shown on screen.

Is warranty expiry date missing and the data retained to be displayed at some future time, or is that lost as the location data is at present.

Also what is the point of the 2 Expiry Date fields on the import file?

Kind Regards,
Andy