No Box 16 - State Distribution Amount on Ohio 1099R

I have an Ohio 1099R from the Ohio Public Employee Retirement System. The last numbered box on the 1099R is #15 - State ID. 

 

The Turbo Tax Premier program asks for input of Box 16 info - State distribution Amount.  I have no Box 16, but do have gross and taxable amounts (Box 1 and 2a), federal and state tax withholding (Boxes 4 and 14) and a Roth contribution (Box 5).

 

So, how to I determine State Distribution Amount as no such info is provided on the 1099R? Turbo Tax requires entry of either a specific dollar amount or $0.

 

Thanks for help!