This is a foreign business income that should be declared on line 135 which
can only be filled through T2125. T2125 require few mandatory information in the
identification section. If you are claiming foreign tax credits on T2209 for
this income, then you do not qualify to file using Netfile. In that case, you
can enter the income on T2125, print(ignore the error) the return and mail
it.
If you are not
claiming the foreign tax credit, then remove the amount from T3, add it manually
to T2125 and complete the form using the info described in the business guide
.