Military 1099-R has data in box 14 as state taxes deducted but Indiana stopped taxing military retire pensions. No Box 16 on my military 1099-R. How to get past Box 16a?

In hind-sight, I should have stopped having state tax withheld. The error is "Box 16a state distribution amount should not be less than state tax withheld.". Not sure what to enter manually for Box 16a to proceed. Thanks.