Using the PCH in the PD related requirement

Dear Freinds,

I would like to know how we should code (standards to be used) when we use

logical database PCH and get objec event. Because in the PNP logical database when

we are using we will use get pernr and macros's like rp-provide-from last etc . But

in PD i dont have idea which macro (if any are there) we have to use , because

basicially my requirement is if i enter the object type as S and object id i want to

get all the jobs' org units with the relation ship given to me can i use the function modules RH_READ_INFTY_1001 in my flow .

because till now i havent used the logical databased pch, so if any body please give me a some code to me it would be great help for me in building the logic.

Regards

latha.