Error : DBIF_INCL_INVALID_CURSOR

Hello All,

I have developed something like following code to extract data from database table in block:

OPEN CURSOR WITH HOLD DBCUR FOR SELECT * FROM (QUERY_TABLE) UP TO ROWCOUNT ROWS.

DO.

FETCH NEXT CURSOR DBCUR INTO CORRESPONDING FIELDS OF TABLE <ITAB>  PACKAGE SIZE BLOCK_SIZE.

CALL FUNCTION 'CUSTOME_FM' ----> This function push data in table parameters to extranal system

           DESTINATION 'BACK'       " (In case of External system call)

            EXPORTING

                P_STOP = P_STOP

            TABLES

                T1 = T1

                T2 = T2.

REFRESH : T1,T2,

ENDDO.

This code works perfectly for 1st  call.

And some times till 2nd or 3rd call.

But meanwhile it drop the looping at  FETCH NEXT CURSOR and raise error DBIF_INCL_INVALID_CURSOR. Not sure whether the FETCH statement losses CURSOR position.

I would appreciate help on this.

Regards.