I had the same issue. It asks "If you wish to claim less than the maximum above, enter it here. The difference will be carried forward to be claimed next tax year."
We entered "0", "0.00" and when you hit continue it will ignore what you have entered and will instead claim the full amount you have contributed. If you enter 1.00 everything calculates correctly, and defers everything (well, less the $1.00) but the zero amount evidently messes up the software...
Hoping they fix this - I would rather carry forward the full amount to a higher income year.
