R/3 to CRM field mapping

Hi

I am trying to map the KOMK , KOMP , KOMV , KONV table fields in R/3 to their corresponding table fields in CRM .

Ex : komk-pstyv is ITM_TYPE in CRM .

By experience i managed to map most of the things that is required.

I am kind of stuck in mapping the following R/3 fields to CRM .

komp-fareg(rule in billing plan)

komk-vbtyp(SD Document category)

KOMP-KONDM (material pricing group)

komp-MATKL (material gorup)

KOMK-FKART (billing type)

Is there any way of finding out the mapping bet R/3 fields and their corresponding CRM fields ????

Any documentation or hint on how to find this out would be really helpful

Regards

Kris

Can somebody