Nonrecourse liabilities may affect the tax calculation.
In order to deduct losses, you have to have Basis in your partnership interest.
Only debt that you are fully at risk on creates basis relative to your partnership interest.
If the lender's recourse is solely to the assets of the partnership and the lender does not have recourse to your personal assets (that is, the debt is a Nonrecourse Liability), the partner may be limited on the losses of the partnership that can flow into the Taxable Income calculation.
That is why the TurboTax Schedule K-1 interview says only the ending Nonrecourse liability number may affect the tax calculation.