HCM Process & Forms(FPM):Where to write the code to show the manager pernr in FPM Form

Hi All,

I am new to HCM Process and Forms using FPM form.

My requirement is to show employee's manager's pernr in the FPM form.As you know the manager's pernr are not stored in any Infotype fields so we need to use the FM developed to get the manager's pernr by giving employee's pernr.

Now my question is where do I need to write this custom code/FM to get the manager's pernr.I am using 'HRASR_DT' tcode to create my Process,Form scenario  for FPM form etc.

System: ECC 6.0,EhP 6

Thanks in advance.

Thanks & Regards,

Hafizul