Courses offered by SU Abroad overseas centers are listed on the web. See http://suabroad.syr.edu/. These courses have SU course numbers so it's easy to see how they fit into your program. The situation is a bit more complicated for courses taken through SU Abroad's World Partners program. They won't have SU course numbers and how they transfer back to SU depends on the actual content of the course.
Most economics courses offered through SU Abroad centers are 300 level and can be counted as upper division electives. Very few SU Abroad courses require ECN 301, 311 or 302 as prerequisites, so they generally can't be used to satisfy that part of the requirement. However, some campuses offer ECN 481 "Introduction to Money and Banking", which as ECN 302 has a prerequisite.