As a note to myself, and for others who in the future might encounter this problem of how to source Rentals to states, these comments will be helpful.

This is a 1040 with 2 states, where the rental is located in one state should be coded this way on screen 22, Codes 3, 10.

This prevents the rental from appearing on the Oregon return. (OR is not the resident state.) but lets it flow to Federal and the other state.

On the E input (Screen 18, Code 11), I have the same US and OR codes.

Why am I doing Intuit's job?!??! Please provide better instructions for state sourcing.