Where 1 point is all you need!
Example:
If a coupon has a maximum limit of 50 coupon generations and it has been reached, you won't be able to generate the coupon even if you have points available. So it's possible that you won't be able to generate this coupon at all.
or
If a coupon has a limit of 1 coupon generation per user and you have generated yours, you won't be able to generate the coupon anymore even if you still have points available.
Updated Mar 18, 2015