New Deduction Code for and Employer Contribution

We recently added a new code for an employer discretionary contribution to the a 401k. The is setup as all other, with no base and fixed amount (the amount is based on a fixed $ for each employee). Each employee has been setup with the code and a specific amount as been assigned to each employee. When calculating payroll, this new deduction is not being picked. I can't understand why.

Thanks for your help.

AG