SQL> desc QCMT066
Name                                      Null?    Type
----------------------------------------- -------- -------------
FCODE                                              VARCHAR2(20)
VORGA                                              VARCHAR2(2)
TRTYP                                              VARCHAR2(1)
BEVAR                                              VARCHAR2(2)
BUVAR                                              VARCHAR2(1)
DYNNR                                              VARCHAR2(4)
AKTYP                                              VARCHAR2(1)
FCODE_NEU                                          VARCHAR2(20)
STATUS                                             VARCHAR2(20)
TITEL                                              VARCHAR2(3)
XWIND                                              VARCHAR2(1)

SQL> select count(*) from QCMT066;

  COUNT(*)
----------
      1987

(IMP) TABLE: "QCMT066"
TAB: QCMT066
FIL: /usr/sap/put/expdirnew/DATA/SAPAPPL1.001 #20050420164021
EOT: QCMT066
(IMP) DATA: 1987 rows in table "QCMT066" #20050420164021

#Trying to create primary key "QCMT066~0"
DbSl Trace: ORA-1452 occured; SQL statement is ==>

(OLD) ERROR: CREATE statement failed for object "QCMT066"
   (CREATE UNIQUE INDEX "QCMT066~0" ON "QCMT066" ( "FCODE",
"VORGA", "TRTYP", "BEVAR", "BUVAR"  ) TABLESPACE PSAPBTABI
STORAGE (INITIAL 0000000016K NEXT 0000000080K MINEXTENTS
0000000001 MAXEXTENTS 0000000300 PCTINCREASE 0000 ))
DbSlExecute: rc = 99
(SQL error 1452)
error message returned by DbSl:
ORA-01452: cannot CREATE UNIQUE INDEX; duplicate keys found

#STOP: 20050420164022

  Before the export, delete QCM tables from your system. Proceed as follows:
...
i. Before deleting you must check
  that the tables are consistent (no restart log or conversion procedure termination must be displayed)
  that the data of the original table is legible
  If application programs do not run correctly which use the affected original table, do not delete the QCM table yet.
ii. Start transaction SE14.
Choose Extras → Invalid temp. table
All QCM tables that can be deleted are displayed.
iv. Mark the tables and delete them.