additional information:
The only form causing the warning message is the form HR_CDN_TAR215_SS.
This is for Québec only and we don't use it for Manitoba.
But I still have one remaining question:
I have noticed at the bottom left corner of the T4 2015 form:
T4(14)
But when I look at the T4A 2015 form:
T4A(15)