ORA-12838: cannot read/modify an object after modifying it in parallel

Question

I am getting the above error when i hit this part in my load ....
can somebody suggest me why it could be in this case ?
MERGE INTO PART1 H
USING (SELECT PA1,                              PART1,                                   CON1,                                   GEO1,                                   COUN1,                                   KIT1                          FROM W1 ) WH ON
                                   (H.PART1=WH.PART1)                                   --on PK darshan 01-03-2006
     WHEN MATCHED THEN
UPDATE SET                                   H.CON1     =WH.CON1,                         H.GEO1     = FN_GETGEOCODE ( WH.GEO1 ),               H.COUN1     =WH.COUN1,                         H.KIT1     =WH.KIT1,                    H.DT1     =TO_NUMBER(TO_CHAR(FN_GETGMTDATE(SYSDATE),'YYYYMMDD')),                              H.DT_LAST1          = FN_GETGMTDATE(SYSDATE)
          WHEN NOT MATCHED THEN
     INSERT     (H.PART1,                                   H.PART2,                                   H.CON1,                                   H.GEO1,                                   H.COUN1,                                   H.KITD1,                                   H.DT1,                                   H.DT_1,                                   H.DT_LAST_1)
          VALUES(CASE FN_MERGE_COUNTER(gpi_inserting)
               WHEN 0 THEN     WH.PART1 END,                         WH.PARTN1,                              WH.CON1,                              FN_GETGEOCODE ( WH.GEO1),                    WH.COUNT1,                              WH.KIT1,
          TO_NUMBER(TO_CHAR(FN_GETGMTDATE(SYSDATE),'YYYYMMDD')),                                   PKG_COMMONACTIVITIES.FN_GETGMTDATE(SYSDATE),                                        PKG_COMMONACTIVITIES.FN_GETGMTDATE(SYSDATE)
                                        );

Answer 1

does this give you a clue?
SQL> CREATE TABLE t AS
  2  SELECT owner, object_name FROM all_objects
  3  WHERE 1=0;
Table created.
SQL> INSERT /*+ APPEND */ INTO t
  2  SELECT owner, object_name
  3  FROM all_objects;
8982 rows created.
SQL> SELECT * FROM t;
SELECT * FROM t
ERROR at line 1:
ORA-12838: cannot read/modify an object after modifying it in parallelI bet that you need a commit after loading w1.
John