We have been using mod-user-import to begin importing user records into a Fameflower environment at Duke.
It appears that if you are using mod-user-import, and you set one user record to have a value for externalSystemId, it expects all of your users to have a value for externalSystemId.
This is problematic since it's not a required field on the user record and may not always be present in a bulk load of users, depending on the institutional approach to loading those records.
It's clear that mod-user-import needs to have a match point, but I'm submitting this to flag this behavior in consideration of whether you should be able to use other match points in the system (like barcode or username.)
Tagging interested parties: md331