Provision Amount To Be Generated Through Payroll

Dear All,

We required expenses provision amount posting through the payroll. due to this I have created wage type in info type 0008 accordingly I have assigned G L accounts also but system has not calculated Bonus amount for the month of jan 2011 as a provision so that i think i have write a PCR so please help me how can i start the PCR in this scanario.

Balwant.