Yes, I too have noticed that overriding a field can block netfile. Frankly, non provision for when one runs out of space is a sloppy /poor TT programming where they have simply computerized a flexible paper system and then expected it to just work. CRA shares a minor part of the blame because netfile will not accept additional material with a tax return.
Methinks you should write "see attached list" and put the totals in schedule 3. That way, you have been truthful, accurate and complete with the CRA and submit via netfile. Then after your return has been assessed, you can either a) send in your list or b) wait for CRA to request it, with an explanation that netfile prevented you from submitting your list with your return. I cannot see them being able to do much about it since it is a failing of TT and their system, and CRA does want you to use netfile.
After all, CRA is looking for those that have not declared a sale, so they do not do much if anything with your information unless they are diligently checking land registry changes.
