Waiting Days for Company Sick Pay (OSP) Absence Scheme

Oracle EBS 12.1.3 RUP14

We've been asked to set up an OSP absence plan with 3 waiting days before OSP is paid.

We've managed to achieve the 3 waiting days by adding 'WAITING_DAYS = 3' to the extra inputs formula but the pay is coming through as 2 days OSP plus two days SSP instead of 2 days pay inclusive of SSP.

The SSP for the period of full pay needs to be offset against the two days full pay, for example:

Absence = 5 days, 2 days OSP due inclusive of 2 days SSP

2 days full pay = 276.92

OSP Full Pay: 276.92 - SSP 38.54 = 238.38

SSP = 38.54

Total Sick Pay = 276.92

Is there a statement we need to add to the offset section of the xx_OSP_ABSENCE_PAY_INFORMATION_FORMULA?