AE instance were at different versions. AE 11.3.6 sp2 added the condition field to calendars.
Resolution
AE instance were at different versions. AE 11.3.6 sp2 added the condition field to calendars. https://docops.ca.com/ca-workload-automation-ae/11-4-2/en/release-notes/ae-release-notes/ae-release-history
If exporting from something greater than 11.3.6 sp2 and attempting to import it into something less than 11.3.6 sp2 then delete the description before attempting the import otherwise errors can occur leaving the condition field for calendars blank.