Relation between tables

Hi,

Can anyone please give me the relation between the tables BKPF, BSAD, REGUH, REGUP, PAYR.

I have prepared internal tables of these tables and have some data in all them.

Now I need to read these tables and populate them into a final internal table. I am confused which table should I loop and which to read in the loop.

Please give some advice.

Thanks in advance.