When checking the user's learning plan on LMS administration side, you notice that some curricula were assigned by System AP while others were assigned by the Admin. However, in both cases the Assignment Profile was used to assign these curricula. It was not a manual curricula assignment by the Admin.
Please check the following screenshot showing this.
SuccessFactors Learning Management System - Assignment Profiles
Reproducing the Issue
Create an Assignment Profile that target a test user
Add a curricula to this Assignment Profile
Add a new item to the curricula
When the user was assigned a curricula via an Assignment Profile, the 'Assigned By' column on the user's learning plan (administration side) displays 'System AP'. However, if the admin added another item to the already assigned curricula, that admin account will appear on the 'Assigned By' column. This is the expect behavior when an admin add an item to a curricula that was already assigned to the user by an Assignment Profile.
System AP, Assigned By, Assignment Profile, Curriculum assigned by Admin , KBA , LOD-SF-LMS-ASP , LMS AP , Problem