Be sure to write it in, no matter what the nature of your previous work unit and post is, but you write it in to represent your sincerity and calmness. If the employer doesn't hire you for this reason, at least you don't have to regret it, because it proves that the employer has no tolerance. The professional courses you study will not affect the nature of your work. You used to do quality control, but now you have at least experience in other things.