Line 14 on W-2

Hello,

I think that I messed up when setting up the Owners payroll deduction for his health insurance and dental insurance. I was told that his insurance is taxable, and I needed to set it up an item in the payroll Called Health Insurance Taxable and in doing so under the tax tracking type there is a drop-down list of different items. I chose the "SCorp Pd Med Premium" so when I went to print the W-2's he has a negative amount under Line 14. Which is the exact amount of the Dental and Health insurance that was taken out of his paycheck.  So, this is a two-part question

1) What should it have been if not the "SCorp Pd Med Premium"

2) How do I fix this issue since the last paycheck was already issued. 

I can't seem to move on with the reporting of the W-2's with a negative.