Please ensure that the Interest Rate is set up and accurate as the system uses this value to calculate interest on Pensions in Payment. (How do I set up Pension Interest Rates?)
Benefits>>Pension Admin>>Administration>>Calculations>>Pensions in Payment Increases Calculations
To view the calculations, navigate to Pension Admin>>Reports>>Employee Reports and Select the report you wish to view;
OR
Navigate to Pension Admin>>Pension Administration>>Personal Data>>[find employee]>>Pension History.