Thank you for your courtesy.

This is an S corporation return.  The aggregate amounts showing in Box 17AC of the Schedules K-1 tie to gross receipts on Page 1, Form 1120S.  But I don't know why they appear there in the first place.  In the IRS instructions for Box 17AC, there are a number of references to obscure situations, none of which apply, in addition to "gross farming and fishing income", which does have a line in the K-1 input screen for Box 17AC.  But this is not a farming or fishing entity.  I double-checked the NAICS code, but it's correctly shown as the service business that it is.