This list https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotax_fed_online_individual.html shows that the 8915E is available to e-file. If there is in fact additional programming to be done the list should be updated with a new availability date. That would prevent needless deleting forms and resubmitting forms to try and get rid of the error.
If I submit my tax return without form 8915E I have to pay money. If I submit it with, I get money back. Its better to just wait until the programming is completed.
