Function module to fetch WBS element from Project system to CATS

Hi Guys,

Can someone help me out to get the FM to fetch WBS element from Project system to CATS based on data entry profile and pernr as input.

Also let me know the rperequisite at project system side as i am not aware of that part... Till now i have create a project and WBS and assigned it to personnel number via tcode - CJ20N.

Thanks in Advance,

Praveen