When to take business classes at Berkeley

Hi again!
I’m starting as a Freshman at Berkeley next year and, among other options, I’m considering a double major in Chemistry and Business (if I can get into Haas, of course). I planned out a tentative schedule for the next four years, including all the business and chemistry courses necessary for graduation, but I realized there are some business courses whose descriptions say “Restricted to Undergraduate Business Administration Majors Only.” However, these courses (like UGBA 100) often come numerically before other courses (like 101A and 101B) that don’t contain this description. Is UGBA 100A just an anomaly that truly cannot be taken until one is accepted into Haas? If so, should I plan on taking UGBA 101A and 101B before 100? Sorry if this post is confusing, as I can’t quite make heads or tails of the whole process. Thanks in advance for your responses!
Danny