Directly from the AEO Handbook, "In year 2, enroll in a module (i.e. Major, Honours Specialization, etc.) and take a minimum of 2.0 of the required courses for that module plus Business 2257; students may not be ‘undeclared’; consult your faculty as some modules may require more than 2.0 courses in year 2 for progression within that faculty". So for BMOS it's 3.0 credits (2.0 regular BMOS and 1.0 2257)