Use Case: Duplicate a gradebook structure before students are added.
A gradebook exported from one site, students removed, formerly imported to another site (11.4). As of 12, one student in the site matching one student in the gradebook is required.
This prevents "Import from Site" , "Duplicate" and and using a course as a template in SIS importing to be unable to copy ...? I think. More testing required. This is a placeholder.
The screen offers conflicting messages on what to expect.