When a business such as a partnership has assets on it's 1065 return like real estate or machinery, it gets depreciated on the 1065. The depreciation on the 1065 provides a deduction, reducing income, for each respective member on their K-1.
In some cases, depreciation adjustments are shown on box 13W of the K-1.
I suggest checking the original business return such as the 1065, or 1120-S eturn to make sure all assets are added and depreciated on that tax return.