To answer your question, you should not be disqualified from taking the exam just because you made a boo boo. However, if you failed to carefully read the application form, you may have a bigger problem ahead of you at the exam. If I remember correctly, you were suppose to click if it applies, if not, leave blank.
The proctors at the exam are clueless with the HRD CS process, they are just your average joe who are there to administer the exam and keep an eye on you. At the exam site you will be given an envelope for you to provide any supporting documents along with your exam.