Another possibility as nobody yet chimed in: You already filed. At this point you would have to amend the return and maybe that is why it won't let you change it since it was accepted. The system knows it was accepted.
**I don't work for TT. Just trying to help. All the best.
***Say "Thanks" by marking as BEST ANSWER and clicking the thumb icon in a post and that I solved your question
**Mark the post that answers your question by clicking on "Mark as Best Answer" I am NOT an expert and you should confirm with a tax expert.
