Switching Back and Forth Salary to Hourly

My question involves employment and labor law for the state of: Wisconsin
I worked for this employer for 7 years. I signed a contract stating that I was salary. From the time I started to my termination (June 6, 2014) if I didn't work a full 40 hours he would tell me that I needed to make up my time or take vacation. Most of the time it was an hour here, two hours there and I had to make sure I made up my time so that my timesheet reflected 40 hours. However, if I worked over 40 hours (which was more often than not) I wasn't allowed to use that towards the time I needed to make up. I always made up my time because I didn't want to be docked on my check. Can he do that?

Salary and hourly are just payment methods which do not mean much by themselves. What is important is the Exempt status. What is your industry? What are your job duties?

Past that federal law (FLSA) does not care about vacation/PTO. Your state is not my state, and I will defer WI rules on vacation/PTO (if any) to another poster.

There is only one state that has any laws at all regarding how vacation/PTO is used while employed. The other 49 states do not care at all, and the remaining state (CA) does not care very much.