It does not matter that you did not sell the property in Oklahoma. Oklahoma uses your total income to determine the tax rate and then applies that rate to your Oklahoma income only.
From the Individual Nonresident/Part-Year Income Tax Return Packet:
The Oklahoma taxable income of a part-year individual or nonresident individual shall be calculated as if all income were earned in Oklahoma, using Form 511NR. The Federal Adjusted Gross Income (AGI) will be adjusted using the Oklahoma adjustments, allowed in 68 Oklahoma Statutes (OS) Section 2358, to arrive at AGI from all sources. The AGI from all sources is used to determine the taxable income. After the taxable income is calculated, it is prorated using a percentage of the AGI from Oklahoma sources divided by the AGI from all sources. This prorated tax is the Oklahoma tax.
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