Two rows with the same primary key have been downloaded for table '%1'

Error constant SQLE_DUPLICATE_ROW_FOUND_IN_DOWNLOAD
ODBC 2 state 01000
ODBC 3 state 01000
Parameter 1 Name of the table being downloaded.
Severity 10
SQLCODE 145
SQLSTATE 01W27
Sybase error code 13254
 Probable cause