Sec 44ab if more than 1 businesses

Hi Rules say if an assessee i doing business along with profession then if one thing is covered under 44ab then he has to undergo the audit of 44ab for another thing too. Example if bst. Turnover is 2 cr (above limit) and profession turnover is 20lac (that is below limit of 25) In this case profession will be audited too. My question is that if person has 2 businesses and no profession then above rule is applicable or not? Turnover of 1 bst is above limit and turnover of another bst is beliw limit