You have to complete the Supplemental Business Expense Worksheet.  In the forms list it is about 5 down from the K-1.  Then it will flow as UPE to Schedule Ep2.

On the partners 1040, K-1 worksheet, right below Line 20Z is a Quickzoom button to get to the UPE worksheet.

Right after box 12 on the K1 worksheet is a quickzoom.  Use that to get to 179 info and for some reason the box you are looking for is right there.