Deductions to Oklahoma Income for a Non-Resident

My wife and I are residents of Texas.  Our only income from Oklahoma is from a trust.  TurboTax asked about applying our IRA deductions to our Oklahoma income, which reduces it below the $1,000 requirement to file in Oklahoma.  However, I cannot find anything on Oklahoma income tax deductions on their state tax website.  Is that an appropriate deduction for non-residents?