Oregon State taxing my social security

I moved to Oregon from Washington State in October 2024.  I received 3 months of social security after I moved to Oregon.  On the Turbotax "identifying Oregon source income" page it shows the full year social security  taxable amount in the federal column.  Am I supposed to enter the federally taxed amount for the three months I lived in Oregon, or do I enter $0 since Oregon does not tax social security.  If I do the former, turbotax taxes it.  If I enter $0 it does not tax it.  If I enter the 3 month amount, where does it get subtracted?