Hi,
Kepp breakpoint in the Include 'LKAUPF01' line number 464, Execute same process again in Transaction CN25. It will stop at the break point. See the entries in the internal table COBK_INS.
Open SE11 in another session, give the table name 'COBK' and search this table with any same entry which are in internal table COBK.
Thanks & Regards
Bala Krishna