Foreign income on T2

It would be nice to have a review message when if either foreign business, or foreign non-business income is entered on Schedule 21 we have a warning to enter the foreign income on Schedule 7 as well in order to properly reduce the small business deduction.

This got missed for one of our clients this year, so we would like to have a warning.

@justinredmond
Consider it done for the next release. Have a great day!

Steven