CPP/QPP contributions or pensionable earnings have been entered incorrectly. Check the amounts entered on your T4;.There is no mistakes after revision. What is the issue?

I have received a T4 and relevé 1. When I get to the revision at the end, it is telling me that:

CPP/QPP contributions or pensionable earnings have been entered incorrectly. Check the amounts entered on your T4; particularly b...              

I revised multiple times but all the information of both forms are properly entered. The only thing different this year is that a value in box 43 (Canadian Forces personnel & police deduction). Box 16 of the T4 and box B-1 from the Relevé 1 are the same, so I do not understand why those numbers would not have been entered correctly. 

Thanks!