13H is investment interest expenses which defaults to form 4952, where the allowable portion is calculated
1065 k-1 13H instructions
Code H. Investment interest expense. Include this amount on Form 4952, line 1. If the partnership has investment income or other investment expense, it'll report your share of these items in box 20 using codes A and B. Include investment income and expenses from other sources to figure how much of your total investment interest is deductible. You'll also need this information to figure your investment interest expense deduction.
If the partnership paid or accrued interest on debts properly allocable to investment property, the amount of interest you're allowed to deduct may be limited.
For more information on the special provisions that apply to investment interest expense, see Form 4952 and Pub. 550, Investment Income and Expenses
13ZZ can be entered as a total assuming it's both trading investment interest and other deductions both reported on schedule E. 13 ZZ requires a sub- worksheet where you enter the detail. evidently there's a bug because no sub-worksheet opens for 13ZZ. contact support.
