Insert into BRANCH with no Section created

I can actually run this from mysql shell:

insert into jtalks.BRANCH values(1, '1', 'Java Basics', 'For noobs', '1', 1 );

And the result doesn't depend on whether the appropriate Section is in the database, which leads to inconsistent data in the database. Of course I can't see such branch at the JCommune GUI itself.
Expected result should be an SQL error which says that I can't insert a invalid SECTION_ID. Please, add constraints to the hbm files.