copy failure

I am doing a copy in one of the jobs, it fails for the reason below:
Below is the joblog:
Can some one let me know how to make sure copy successful?
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CPYF FROMFILE(dlester/CHIFMTSBK) 
TOFILE(GMSPROD/CHIFMTS) MBROPT(*ADD) 
Message . . . . : Key for record in member CHIFMTS reserved. 
Cause . . . . . : The output or update operation on member CHIFMTS, file 
CHIFMTS in library GMSPROD, record 0 format CHIFMTS member number 1 was 
not successful. Format CHIFMTS member number 1 is under commitment control 
and has the key reserved. If the record number is zero, the duplicate key 
occurred on an output operation. 
30 01/10/07 14:09:09.785632 QDBSIGEX QSYS 01D6 QCPGENIO QSYS 
Message . . . . : Duplicate key on access path for based-on member of 
CHIFMTS. 
Cause . . . . . : An output or update operation on record number 0 record 
format CHIFMTS member number 1 failed because of a duplicate key in a unique 
keyed member that is based on member CHIFMTS file CHIFMTS in library 
GMSPROD, or in a based-on member of CHIFMTS. The key is a duplicate of a 
reserved key under commitment control. Recovery . . . : See previously 
listed message CPD4068 to identify the record with the duplicate key and 
change the key value so that it is unique. Then try your request again. 
Message . . . . : Cancel reply received for message CPF5085. 
Message . . . . : Error writing to member CHIFMTS in file CHIFMTS. 
Cause . . . . . : The file was not copied because an error occurred while 
writing records to member CHIFMTS in file CHIFMTS in library GMSPROD.
   
  Regards
  Donna

 
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