Form RRB-1099 and Form RRB-1099-R are two different forms. The form you are describing is Form RRB-1099, the blue form. But the page you are on in TurboTax is for entering Form RRB-1099-R, the green form. The box numbers on the two forms are different. To enter Form RRB-1099 in TurboTax go to "Social Security (SSA-1099, RRB-1099)."
You have to enter both forms.