Bonus configuration in SAP HR Indian Payroll

Dear Gurus,

My client requirement is .

Bonus they want to give thorough Off-Cycle payroll.

Bonus- they are showing in 2 parts, (1) Bonus- 11.67% of Basic Salary. (2) Ex-gratia 8.33% of Basic Salary.

Bonus year they are calculating, financial year. Example (01.04.2013 to 31.03.2014)

Client is paying bonus on the month of August 2014.

Example- Employee Basic salary is Rs 10,000.

Bonus = 10,000*12*11.67/100 = 14004

Exgratia= 10,000*12*8.33/100=9996

If an employe's Joining date is 01.06.2013 then his Bonus amount will be

Bonus= 10,000*10*11.67/100 = 11670

Ex-Gratia= 10,000*10*8.33/100=8330

Pls help me out how to configure it in SAP HR.