This has nothing to do with ProConnect but the technicality of how K-1/K-3 reporting should be done in relation to foreign partners.

Did the foreign partner reside in the US but did not have sufficient US days to meet SPT?

Was the guaranteed payment related in whole or in part to the services he/she rendered in the US?

Which country is the foreign partner a resident of, if there's a totalization agreement in effect?

What is reported on K-3?  Which part of the guaranteed payment is US-source ECI?

Is the full amount of K-1, Line 4a reported on Line 14 with Code A?