PF Caliculation for individual Employee

HI All

Could you please explain me the scenario of my client . The employee PF is caliculating on As per the PF Act on 12 % . But for one employee client is caliculating on 10,000/- which will be his PF amount should be 1200 . but actual basic of that particular employee is 50000/- how to map this in sap ? Insted of caliculating ( 50000 * 12 %) = 6000 they are caliculating 1200 from both employee and employer ?

Regards

RBS