You cannot list your Reserved because you have not paid for it yet.

I just split a 3x c5d.4xlarge Reserved Instance into one of 24x c5d.large Reserved Instances.

I've been trying to sell the c5d.4xlarge one for over a month without success, so I thought I'd try selling them as large instead.

Now when I go to sell the RI I get this error message, which is odd because these are 'No Upfront' and therefore never required payment:

More screenshots:

Any ideas how I can resolve this error?