Thanks for the reply.  Appreciate it.  

I did use Schedule K > Rental Real Estate to input my rental activity, which is all domestic activity.  The only data I input at Schedule K > Other Schedule K Items, on the Less Common Scenario tab is a bunch of zero overrides once this issue cropped up.  Stranger yet is that the issue only shows up on Box 16 AA, AB, AC, and AD of just one of my 9 K-1's, all other 8 have blank Box 16's (as they should).  There is no foreign activity form prepared to file, just data in box 16 on one of my 9 K-1's.  There are no foreign partners, no foreign anything.  If the solution is staring me in the face (it may be), I'm just not seeing it.

Thanks again.