If a deduction is not appearing on an employee's payslip, it's be due to an incorrect analysis type in the pay code configuration.
You should only use the Nett Pay analysis code for the nett pay pay code and avoid using it for any other pay codes.
When configuring deductions pay codes, assign them a relevant analysis code. The available analysis codes are as follows:
GP: Gross Pay
BK: Benefit in Kind
NT: Non-Taxable
DN: Deduction (statutory & voluntary)
BK: Benefit in Kind
TR: Tax Relief (tax relief deductions e.g. pension & AVC)
NP: Nett Pay
EN: Employer Pension
ER: Employer NI/PRSI
AL: Apprentice Levy