So, I'm taking Psych 1XX3 in the summer term, but need to register for courses that require it as a pre-requisite next week so it won't be 'completed' yet.

Would SOLAR take issue with this?

Should be fine. I registered in courses that I didn't get the prereq for and got in (for now)

To be safe you could always go see an advisor, and they will waive the pre-req upon this condition that you complete the pre-req this summer still

I have the same problem - I'm taking a pre-requisite course in 2nd semester summer school. I called an academic advisor and he said that as long as you're registered in the course you should be fine. Hopefully he's right cuz this will affect 6 of my courses!

Well in solar it automatically checks to see if you passed the requisites. If there is a problem when you register in solar just call them.