Ind. Code § 7.1-3-1-19

Sec. 19. Character of the Business Test. Whenever the character of the business in which an applicant is engaged is material to his being issued a permit under this article, or is material to his being qualified to continue to hold the permit, it must be made to appear to the satisfaction of the commission that a substantial portion of the business carried on, or to be carried on, in the premises in respect to which a permit is applied for is in the nature of the applicant's main business function in the premises.