We are aware of this issue, and our development team is working on a resolution. Once it is resolved, we will update you in this thread. We appreciate your patience.

Thanks for letting me know. I will await your update after it has been fixed. Thanks

Was there a resolution to this question?

I am still unable to submit due to the error code for this exact problem

Please double check what you have entered on the T1198 form.

Line 68518 Total amount (principal and interest) must be the same amount as Line 68519 - Total principal (current and prior years) PLUS Total interest (current and prior years). 

Also, Line 68519 - Total principal (current and prior years) must be the same as the total amount of total of boxes 68520 through 68560 added together.

You can see lines 10100, 10400, 12799, 12800 and 13000 on your detailed tax summary.