Given the following mapping:

@Entity
public class Team {
    ...
    @OneToMany
    @Where( level = 'expert' or level = 'high' )
    private Set<Player> expertAndHighLevelPlayers;
}

@Entity
@Where( active = 1 )
public class Player
    ....
    private String level;

Currently, the query for loading Team#expertAndHighLevelPlayers would have something like: {{active = 1 and level = 'expert' or level = 'high' }}.

Parentheses should be added to ensure that the separate clauses have the proper precedence, as in: {{( active = 1 ) and ( level = 'expert' or level = 'high' ) }}.