Looks like 1040 K1 code 14E is net investment income. I imagine you would treat it similar to what the note says on the Partnership K-1 input screen for code 20Y:

(20Y) NOTE: Net investment income. The partnership may use this code Y to report information you may need to determine the net investment income tax under section 1411. Enter section 1411 information, or changes to investment income for CFCs and PFICs, in the Other Taxes screen, under the Net Investment Income Tax section (Form 8960).

Make sure not to double enter anything already included elsewhere on the K-1.