Form 1065 Sch K Line 20c

I'm working on my LLC taxes, and on the error check it says to check this entry:  Form 1065 p4-5: Sch K, Line 20c Amt: Other items to report separately must be entered. 

It has highlighted AG Gross Receipts for section 448(c). 

I don't ever remember doing this.  What do I enter here?  I have a very simple computer repair side business.