Nonresident partner; income; how determined
(1) In determining the tax liability of a nonresident partner of any partnership, there shall be included in Nebraska adjusted gross income only that part derived from or connected with sources in this state of the partner's distributive share of items of partnership income, gain, loss, and deduction entering into his or her federal taxable income, as such part is determined under rules and regulations prescribed by the Tax Commissioner in accordance with the general rules in section 77-2733 .
(2) In determining the sources of a nonresident partner's income, no effect shall be given to a provision in the partnership agreement which: