Dump during KPSI

Hello Gurus.

After transfering planned activity requierements for production (KSPP)

we executied KPSI (reconciliation of activities), but we had a dump "DUPLICATE_COBK"

Its part of code:

IF I_ITEMS_INSERT = ON.

LOOP AT T_COBK.

T_COBK-MANDT = SY-MANDT.

* BELNR <> initial

PERFORM CHECK_DOCNR USING T_COBK-BELNR.

* ggf. LOGSYSTEM des Belegs auf initial setzen

IF T_COBK-LOGSYSTEM = T000-LOGSYS.

T_COBK-LOGSYSTEM = SPACE.

ENDIF.

IF T_COBK-AWSYS = T000-LOGSYS.

T_COBK-AWSYS = SPACE.

ENDIF.

* COBK_INS sortiert aufbauen wegen BINARY SEARCH

READ TABLE COBK_INS WITH KEY KOKRS = T_COBK-KOKRS

BELNR = T_COBK-BELNR

BINARY SEARCH

TRANSPORTING NO FIELDS.

IF SY-SUBRC = 0.

MESSAGE X208(00) WITH 'DUPLICATE_COBK'.

May be somebody has already seen such problem?

I'll be appreciate for any help.

Regards,

Ugin