need help on RFC look up in PI 7.0

Dear experts ,

I am working on Jdbc to Abap Proxy  scenario where i need to perform a RFC Look up . I have searched in SCN  and found some help ful blogs, but still need more information in below points.

My requirement is need to fetch Cost Center (KOSTL) by taking Personal number(PERNR)  as Input parameter.

1) Do we have to create and import the RFC into PI ?

2) Do we need to create a UDF ? If yes, Kindly provide some useful links.

Thanks in Advance,

Mohammed