Some statuses on modules in Banner don't give students Minerva enrolments. Most are obvious e.g. WD (withdrawn) and DD (deleted) statuses don’t get module enrolments in Minerva.
Notably, resit without teaching students (C1,2,3 etc) also don’t get module enrolments in Minerva. However students can still see their modules from previous years unless the tutor/Department have made the module unavailable to students. We don't remove any enrolments/change availability.
If you want resit without teaching students to see the current year, any module Instructor can enrol them directly in Minerva.
For staff, the EXCL staff assignment type code on the SIASSGN form in Banner will give no enrolment on Minerva.