I have never been able to successfully book a one way car rental using Aeroplan rewards. I always get the error:
" Oops! There were 1 problems on this form!
- There are no available vehicles that match your selection. Please review your selection criteria and try again."

I have booked numerous return journeys, but never any success with one way. And if I go to Avis or Hertz online and check that route it is fine...

Is there some limitation or is just that I am picking bad locations? (In this instance today it was a YXU->YYZ rental)

Any success/failure stories?