u/TotallyRealMainAcc

For context, I am a 3SG that finished course, but after finish course get rank I got down PES from PCC and now I'm some ASA. However, my old OC is now telling me because ASA can't be 3SG, I have to down Rank to CPL. But I heard down rank only happens if you get charged for like crime and shit, not for down PES? Is it true that I have to demote even after completing the whole course?