Oregon: deducting federal agency bond interest

I've run into the following problem year after year with TurboTax (desktop version). I would like to be able to efile, but of course cannot do this with any overrides. But the ONLY way I've found to complete my Oregon state return is by using an override. If anyone can help, that would be great. I would definitely like to be able to efile instead of mailing (USPS lost my return last year even though it was sent certified).

Here is the problem: I own several U.S. government backed federal agency bonds that are state tax-exempt (TVA, Fed. Home, Fed. Farm Credit). Interest from these appears in my brokerage 1099-INT (line 1). There is no way that I've found in TT to designate that this interest is state tax-exempt in Oregon (there are options to do this for a few other states, but not Oregon).

I therefore am forced to override the amount indicated under Oregon's ASC form, Subtractions, and insert there the amount of interest from these state tax-exempt federal agency bonds. And when I do this, I then cannot efile my return.

Here is the tax status of these bonds, as shown by FINRA:

tax status of fed. agency bond interest

Thanks for any help!