When the instructor or the student views an assignment submission, there is a submission history (introduced in Sakai 10).
If instructor01 submits on behalf of student01, the history displays something like:
"Fri Jul 17 16:47:20 EDT 2015 Jane Smith (student01) submitted"
It should reflect that the instructor submitted on the student's behalf. The linked PR will change the format of the history message:
"Fri Jul 17 16:47:20 EDT 2015 John Doe (instructor01) submitted on behalf of Jane Smith (student01)"
However, it should be noted that these strings are generated at the time of submission and then saved in the XML of the submission object in the database, rather than being generated on the fly. Due to this limitation, this fix will only work for submissions created after this is deployed. Submissions previous to this fix will not display the "on behalf of ..." text for the 'History' component.