Box 16/17 on T4 is Employee's CPP/QPP contributions.
Box 16A/17A is Employee's second CPP/QPP contribution.
Is it on 1 or 2 T4s? And Is it for the same employer?
If you have 2 T4s and it's for the same employer, verify on your CRA my account if this is the last version of your T4. If it is the last version and it is not showing box 16/17 and box 16A/17A on the same slip, we suggest you to contact CRA to see if you can combine both T4s together to have only 1 but with all the amount reflecting your 2024 year.
This is not a software issue, because if you have a 2nd contribution (box 16A/17A), you should logically have a 1st contribution (box 16/17). Technically, both amount should be on the same T4.
Here is the link to contact CRA
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