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

Item Value
SQLCODE -777
Constant SQLE_CANNOT_SYNC_TABLE_WITHOUT_PK
SQLSTATE 5RW16
Sybase error code 13787
ODBC 2 State 42000
ODBC 3 State 42S02
Parameter 1 Name of the table

Probable cause 

Table for synchronization must contain a primary key.