Hi
1: I had the same problem for inputting Box 17(Tax withheld) of NR4 to UFile.
2: UFile auto generates T1159 but with Box 43700 (Tax withheld) empaty.
3: Without inputting the value of the tax withheld, UFile tells me that I own tax instead of refunding.
4: So I had to fill up T1159 manually for refunding, spending a lot time to do the work which Ufile should do for me.
James