1099r box 2a taxable amount is blank and taxable amount not determined box in 2b is not checked, he total distribution box is. What do I do for the taxable amount?

Box 7 has distribution code 7 and box 3 has an amount in it.  My husband left his job and started a new job.  All we did was close the retirement account and deposit the check into a traditional IRA within the 60 day time period. I have no idea what to enter into bob 2a and Turbo tax won't let it blank.