Norm32, That is exactly the same issue I have. Negative Capital gain doesn't allow box 68140 to populate. That said, based on CRA's notes that might be the way it's supposed to work.
Line 1 minus line 13 (if negative, enter "0")
If the total is "0", do not complete lines 15 to 19, and enter "0" on line 20. If the total includes an amount from a T3 slip, complete lines 15 to 19 below. Otherwise, enter "0" on line 19.
The two sentences seem to contradict each other.
