I believe the number to which you are referring is the Tuition and Fees Deduction, Line 34 on Form 1040. That deduction is capped at $4,000 per year, regardless of how much more you may have paid in qualified tuition and fees for post-secondary education.
The following guidance is provided by the Oregon Department of Revenue:
"Full-year residents. Oregon allows the deduction you
claimed on your federal return. The federal deduction flows through to your Oregon return via your
federal adjusted gross income. Do not claim an additional deduction on your Oregon return." [Emphasis added.]
For more information, please refer to https://www.oregon.gov/DOR/forms/FormsPubs/publication-or-17_101-431_2016.pdf, page 52.
