If you input the information manually in the Farm section, you should be able to overwrite it. If not, and if it is truly entered twice on Schedule F, then delete the 1099-G.
To Delete a Form
Open your return in TurboTax.
- In the left side bar, select Tax Tools> Tools.
- In the pop-up window Tool Center, choose Delete a form.
- Select Delete next to the form/schedule/worksheet and follow the onscreen instructions
