Infotype PA0015 and ASSOB, ASSHR

hi all,

I have to create entries in Infotype PA0015 via a flat file corresponding to particular WageTypes for a particular PERNR. But the flat file also contains a field Cost Center or Order.

My question is "Do I have to update any other table(like ASSOB/ASSHR) or infotype for linking this cost object to the Personnel No. or just Updating PA0015 is fine?"

What exactly is the use of tables ASSOB and ASSHR.

Preeti