Did you already enter the T4 or T4A for the payment that was received?
Line 68518 The 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.
