Not the solution I was looking for, Client has multiple complex 1065 K-1s with carry-forward issues.  Filing extensions for this client has not been an issue past using 2014, 2015, 2016, or 2017 versions of ProSeries.  Even tried turning off error checking during convert and transmit but same error pops up. Maybe the error will self clear when  Proseries finalizes their K-1 worksheet later this week.