wierd behaviour with setTableName - table name doesn't get set

if i create class called Attribute_set that extends Doctrine_Record and setTableName in setUpTableDefinintion like in documentation setting up models section, the table name appears not to be set
getTableName returns "doctrine_record_abstract"

any joins or relations fail.

if i set it in the setUp function the setTableName appear working and returns "attribute_sets" table name. This only happens with this particular class, and relations have no effect.

I attached class example i'm expiriencing problems with, that should help reproducte this issue