Hi Vamsi,
As per Mr. Vivek said you can control it through PCR before function in schema.
You can design your PCR with the help of period time type and total 12 month's constatnt value in T511k. Based on the time evaluation period you will pass the constant value in time type and will update your absence quota by QUOTA function.
Kindly check and let me know.
Regards,
Sankarsan