Payroll Issue on LWP

Dear Gurus,

I am facing issues on LWP. IF employee take LWP more than one.

1. 1. Salary paid to the employee on working days basis excluding Sundays in every month.
2. 2. For one LWP cases systems works fine with processing class 10 value 2(/802).

Calculation is let’s say basic is 10000 and for 1 LWP in May.2014, basic amt = (10000 –(10000/27))= 9630(with round up)Value match with legacy.

27 is the no. of working days in May. 2014(Excluding all 4 Sundays)

1. 3. The problem is with the LWP for more than one days and it’s in between Sundays.

Let’s say in month of May. 2014 if employee was on leave for 15 days i.e. from 1st May. to 15^th May.

So no of days leave is 15 days and in between that 2 Sundays r there, so the basic calculation was basic = 14*(10000/29)

The formula is

(No. of days left in this month – Remaining Sundays which comes in between working days)*(Basic/ (Total No. of working days in that month) + (No. of Sundays within the availed leave period)

On value wise = [16(from 16^th to 31^st May) days – 2 (within that 16days 2 Sundays r there)] *

[Basic Amt/ (27(Actual working days for that month) + 2(2 Sundays in between 1^st Jan to 14^th Jan)]

So the amount = 14*(10000/29) = 4828

From SAP with processing class 10(2) the value is 5000.

Pls help me how to solve this.