Actually, I just had a chat with my co-worker (he is an Immigration Officer with Saskatchewan Immigration). I do work for the same Government but different Department. This is what he told me: 'It is not a mandatory requirement, but the Border Officer has the right to ask if you can support yourself and your family in Canada when you immigrate (Land). Our case is little easier because we have been here for a while (7 years for me) and we all have jobs in Canada as well BUT to be fair and treat every one equally (all immigrants), this question has to be asked... Some might not even ask, BUT if asked you need to provide some answer to that question - whether you have a job, or enough money or investment etc... and some sort of confirmation.
Hope this is clear.