Well, if an Article 22.3 person is working an Inside-Inside job on a particular day, or days, and does not receive the Inside-Inside payrate in his check, then file a grievance.
If you want to really get their attention, file a grievance claiming that the full-timer in question was actually not doing his bid job of Inside-Outside, so he is actually just a regular (non-Article 22.3) full-timer and should get the appropriate wage rate of the New England Supplement Article 67, Section 6, which is almost $31 an hour.