how to reverse FI posting Offcycle payrll and Regular payroll for both current month

Hi Gurus,

As the Employer Pension contribution changes from 6500 to 15000. My client has not updated the Sap Note for this.

for the month 01.09.2014 to 30.09.2014 they run the payroll and Done the FI posting, and also for Offcycle payroll they have run and done the posting.

Now they want to update the sap note for that. How can i do this.

Is it possible to reverse both regular posting and Offcycle posting for the month of Sept.2014.

Pls help me out.

Thanks & Regards

Bapu.