Being asked how much of amount in W-2 Box 12 went to a SIMPLE Roth IRA. I didn't think a SIMPLE Roth IRA exists. How do I correctly enter my SIMPLE IRA contributions?

This is being asked during the review of my federal taxes, after having already entered contributions as SIMPLE IRA. It is asking for $ amount contributed to a SIMPLE Roth IRA, with options of total amount, partial amount, $0, or leave blank if not applicable. I only have one item in Box 12 for with code S, so I'm just not sure what action I should take to ensure correct reporting.