Cannot synchronize table '%1' since it does not have a primary key

Error constant SQLE_CANNOT_SYNC_TABLE_WITHOUT_PK
ODBC 2 State 42000
ODBC 3 State 42S02
Parameter 1 Name of the table.
Severity 16
SQLCODE –777
SQLSTATE 5RW16
Sybase error code 13787
Probable cause

Tables being synchronized must contain a primary key.