More information may help resolve your issue. For example, what "box and code" was used to report this amount on your K-1?
See at this link the IRC step-up rules for an optional adjustment to the basis of partnership property, that results from the transfer of an interest in a partnership by sale or exchange, or on the death of a partner. If this applies to your partnership interest, see the section (4) a little more than half-way down the "scroll", on the Effect of basis adjusment in determining items of deduction.
This is essentially saying that the partner recognized an asset for the increase in the basis of your partnership assets, and is amortizing that adjustment over a specified recovery period. I presume your share of that deduction is passed to your on the K-1.
I recommend reaching out to the preparer of the K-1 for guidance on how to deduct this on your personal tax return.
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