The Option Requirements of many Plans in Arts and Science allow you to substitute courses from outside the discipline. For example, the Department of History allows you to use certain CLST (Classical Studies) courses as substitutions for their upper-year History options. These options usually appear on a Course List. However, only a limited number of substitutions are usually allowed. If you receive this warning, it means you’ve exceeded this limit.
The courses listed in the warning may still be used towards the elective component (total unit count) of your degree, but you will have to choose one or more further courses within the discipline to use towards your Plan requirements. You may also wish to seek academic advice from your department.
Note that this warning appears even if you have already completed courses such that no more than the maximum will be used in your Plan. If you identify which of the courses in excess of the maximum you intend to use as electives only they can be excluded from the Plan by student exception and the warning can be removed.