Yes. While you are on leave, you are not able to work as a resident physician (or an extender) because you are not actively in residency training. So, you should contact the CMPA to cancel your membership for the period of time that you are not working. Call 1 (800) 267-6522 between 8:30 a.m. and 4:30 p.m. EST or check out www.cmpa-acpm.ca.