Relationship between DFKKOP and DFKKOPK

Hi,

I have been working on a report which involves in getting data from SAP tables DFKKOP and DFKKOPK. All of the data that I need to have this report going is already in DFKKOP except for GL account (hkont) and profit center (prctr). This is where I need to bring data from DFKKOPK.

Up till now, I have not been able to establish a line item link between these two tables.

Is there any way we can successfully identify a documents line item from DFKKOP in DFKKOPK table and associate it with its correct GL account and profit center?