I've had the same hassles with 20(11) for years, because of Ireland and Finland stocks held in a Canada-based US$ brokerage account.
This year, I think I'll try to use this suggested approach to change the 20(11) claim to $0.00. Probably end up paying a bit more taxes this way, but I'm sick of getting hassled by CRA every couple years because of it.
I just tried it out, and I noticed that the 20(11) field on the FTC sheet changes to red, denoting a field override. I was under the impression that any overridden fields will prevent me from using NETFILE. That would be a serious inconvenience.
