Very Important: includes in hr reports : Points assured

hi all..

I am relatively new to HR reporting especially payroll reports.

As i was going through some reports i came across some includes

eg. INCLUDE rpc2cd09.

INCLUDE rpc2ca00.

INCLUDE rpppxd00.

INCLUDE pc2rxin0. etc

I learnt that these include names are coded as per the requirement i.e. rp for read payroll c2 for reading cluster table pcl2 etc but i am still not very clear about the process i.e how to decide which "include" to include in the program. If some report is to be developed then how to decide which includes to use in the program. I am asking in context of indian payroll only.

Could anyone please provide clear explanation for those includes or any document explaining the process.

thanks in advance

points assured