The rules on the virtue Magic Sensitivity states that: "However, your sensitivity makes you more susceptible to magical effects: subtract your Magic Sensitivity score from all magic resistance rolls you make."
Hmmm... I must be in a typo-busting mood (or maybe it is because I am making a new magus character, yeah ), and I believe I just found another one in HoH:TL (p 75), where the Odor of Lingering Magic spell with Smell target states Vision in the calculations below.. but I just realised that it is already in the errata.