I had attached an example for you. In the attachments, the four images.

Basically, I am F1 visa international student, I violate the student enrollment policy which I cannot enroll two online class when on campus class units less than 9 units.
My school intertnationl office ask me write a letter to explain and justify this issue.
You can see my transcript, I had taken 4 classes in fall 2019. and online course is japan9 and econ2, my in class course is engl2 and math 7 which are only 8 units on campus, less than the minimum 9 in class units.