If you received disability, you should have a dollar amount in box 16, and a number of months in box 21. If you received CPP pension, then you should have a dollar amount in box 14 and a number of months in box 23. If you received both disability and CPP, then all 4 boxes should be filled in.
If you are still not able to resolve this issue, please contact our phone support team at 1-888-829-8608.