So, there is a week that I needed to take off. I couldn't get the week for my vacation because it was booked but I asked my supervisor if I can use all five of my personal days for the one week and he approved it. But for some reason, my union rep told me it's one of the worst things I can do, that it will bite me in the butt in the future and could potentially ruin my chances to go full time this year. I don't understand why this should be a problem, I have the days and I gave plenty of notice. Any thoughts?