I am receiving the same error as well when attempting to e-file an Indiana return at a later time than when I e-filed my Federal return. It states the Federal Return has been transmitted when selecting to e-file my Indiana Return.
I have confirmed that TurboTax is receiving the status that my Federal Return has been Accepted by the IRS which I have read online is a requirement when e-filing state taxes at a later date.
I have also confirmed that I have the latest TurboTax software updates as of this posting.
