IS-U enhancing transaction FPBW (open items extraction using table DFKKOPBW

Has anybody experiances with IS-U Accounts Receivable & payable - 'Open Items' extraction using transaction FPBW

(which fill the table DFKKOPBW).

1. I need to fill an custom included structure in this table (DFKKOPBW) and I am searching for the correct time (for performance reasons) & place in the (SAP) source (in the program flow) to do this.

2. Anybody any clues on Custum/user exits in this part?

See also function group FKKOPBW.

Jos Reithofer