If the Service Months field is blank, the deduction/benefit will not calculate.
System Administration Menu -> Payroll Controls -> Deduction and Benefit Codes Entry (KE0036) -> Select a code -> Select the Rates (KE0037) button
Review the Deduction and Benefit Codes Entry for the setup, shown outlined below.
**Retirement/Months and Annual/Months options use the Service Months as part of the calculation.
Employee Maintenance (KE0001) -> Select the tab labeled Service Years (KE0078)
Then review the Employee Service Years screen (KE0078) for the Service Months setup.