I tried to register and learned there is a hold on my account. Tuition refers to the instruction fee only.
Fees refer to all other mandatory enrollment fees.
The UO student billing system operates like that of most major credit card companies. There is a monthly billing cycle, and statements are produced on the fifteenth of each month. Payments, due on the first day of the following month, are considered past due if received after the tenth. Students pay them even if they do not use the services they cover. Tuition and fees are considered mandatory fees and can not be waived.