This is a tough one to answer without the spreadsheet. Usually, though to import, it needs to fields that form the primary key in the spreadsheet, which in the case of a work order is usually the WONUM and SITEID, but it's possible to nominate other keys. Have a look also at the Exclude/Include as a key field, may not be able to be exported as it's been excluded.
BTW: The object structure I see in the screen shot is a custom one, so we don't know how its been set-up.
------------------------------
===============================
Craig Kokay,
Lead Senior Maximo/IoT Consultant
ISW
Sydney, NSW, Australia
Ph: 0411-682-040
=================================
#IBMChampion2021
------------------------------