You should be able to correlate the Section 199A income reported on the supplemental statement with one of income boxes on the K-1: box 1 for ordinary business income, box 2 for rental real estate income, or box 7 royalties.
If the only income on the K-1 is for the PTP itself (i.e., there is no "pass-through" by the partnership of income from another business), then then Section 199A income for the PTP is somewhere "within" the other income being reported on the K-1.
If you can't make this correlation on your own, you will need to contact the K-1 preparer for guidance.
Note that if the partnership does have Section 199A income passed from another entity (different EIN that your partnership), you have to "split" the K-1 and enter one K-1 with the actual partnership numbers, and another K-1 for the passthrough entity numbers.
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