I can’t change the school back to CSU Fullerton

Colleges and Universities A-Z California State University - Fullerton
1

I was changing the school I had for CSU Fullerton as my school of choice and I wanted check something so I changed it to UCLA. Now when I try to change it back to CSU Fullerton is not letting me and it says that the changes cannot be save.

2

Changing the schools for what purpose? Enrolling, financial aid???