Turbotax is asking for information from box 16A on my form 1099-R. My form stops at box 15. Where do I get the information that turbotax is requesting?

Turbotax wants to know what my state distribution is compared to my state tax withheld. Tax withheld is box 14 (form 1099-R) turbotax says that state distribution is box 16. However, my form 1099-R does not have a box 16. What do I enter for turbotax?