Foreign key '%1' for table '%2' duplicates an existing foreign key

Error constant SQLE_DUPLICATE_FOREIGN_KEY
ODBC 2 state 42000
ODBC 3 state 42000
Parameter 1 The role name of the new foreign key.
Parameter 2 The table containing the foreign key.
Severity 16
SQLCODE -251
SQLSTATE 52W06
Sybase error code 1909
 Probable cause