TurboTax refers to a "required holding period" for a mutual fund. That refers to the time I owned the mutual fund shares, or to the time the mutual fund owned its shares?

After importing a 1099-DIV, TurboTax asks "Do these uncommon situations apply?" and one check box says "Some qualified dividends or section 199A dividends are from securities that didn't meet the required holding period." Under which circumstances would I see 199A dividends in Box 5 of my 1099 and yet want to put a checkmark in that check box that TurboTax is offering me?