Ill vouch for this as well as a few of my other eng & management friends.
I took both Econ 1B03 and 1BB3 in my first year of eng. However, I am not able to select Econ 2X03 as stated in the requirements for Mech & Management II, as it states that I do not have the pre-reqs.
And I passed both 1B03 and 1BB3 with flying colors.