Why can't I deduct obamacare premiums not covered by PTC as a business expense on schedule c to lower self-employed business profits?

Example, I pay $19k in obamacare healthcare premiums per year. 

I get $9,000 in PTC.
$7,000 of the premiums, the amount not comp'd by PTC, are deductible for calculating income tax. 

But then $2,000 of the $19,000 is uncategorized. Does not appear on the return. It makes my self-employed business appear more profitable when calculating self-employment tax than it actually is. 

Healthcare premiums not covered by PTC should be a business expense on schedule C? But doesn't work in TurboTax SE.