Retirement tax questions

Thanks @DanaB27 for the quick response.

A quick follow-up query on the same - can I leave box 15 blank (State ID/ Payer's State No)? I don't have these details with me as I don't have the 1099-R yet (which would likely be mailed only next year). I prefer to not have to amend the tax return if the actual 1099-R (that would be mailed next year) ends up having different information from what I put in my tax return, hence being cautious. Thanks!