Most likely you did contribute to your Retirement Plan through Payroll Deduction.
Check your W-2. If the 'Retirement Plan' box is checked, your contribution amount is probably the difference Between Box 1 and Box 3 on your W-2.
However, this amount is not deductible since it is already pre-tax, so you don't need to make an entry in this section. Just enter your W-2 as shown.
Click this link for more info on School District Retirement Plans.
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