There must be a bug in the Ufile software.
I wasted at least a day trying above methods methodically. None of the above methods worked for me, possibly because the extra complication that T4A revenue came to my wife, and the self employment business is a partnership.
I was forced to delete the T4As and put the income in Other income in the business. Tax amounts the same, I hope CRA does not try to add in the T4As again. Now I can netfile.
Ufile; please investigate this bug.