"Net nonfiling corporate partners' shares of income and deductions as reported to the Federal Government." That portion of the income, less the deductions:
If the entire business of the partnership is not transacted in this Commonwealth, the amount computed under this definition shall be apportioned to this Commonwealth as provided in section 401(3) 2 as if the partnership were a corporation subject to tax under this article.
"Nonfiling corporate partner." A partner which:
"Partner." An owner of an interest in the partnership, in whatever manner that owner and ownership interest are designated.
"Partnership." An entity classified as a partnership for Federal income tax purposes.
72 P.S. § 7403.2