Doctrine, different file names, different tables generation

I am trying to create tables from models using the createTablesFromModels method of Doctrine. I have a /model folder where I keep my models but it depends on the file names how the tables are generated.

Inside 3 files I have the following:

class Item extends Doctrine_Record {

public function setTableDefinition() {
    $this->hasColumn('nombre', 'string', 45, array(
        'notnull' => true
    ));
    $this->hasColumn('enunciado', 'string', 90, array(
        'notnull' => true
    ));
    $this->hasColumn('imagen_reposo', 'string', 90);
    $this->hasColumn('imagen_movimiento', 'string', 90);
}

public function setUp() {
    $this->hasMany('Prueba as Pruebas', array(
        'refClass' => 'ItemPrueba',
        'local' => 'item_id',
        'foreign' => 'prueba_id'
    ));
}
}

class Prueba extends Doctrine_Record {

public function setTableDefinition() {
    $this->hasColumn('nombre', 'string', 45, array(
        'notnull' => true
    ));
    $this->hasColumn('consigna', 'clob', 65535);
    $this->hasColumn('consentimiento', 'clob', 65535);
    $this->hasColumn('codigo', 'string', 45);
}

public function setUp() {
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        'refClass' => 'ItemPrueba',
        'local' => 'prueba_id',
        'foreign' => 'item_id'
    ));
}
}

class ItemPrueba extends Doctrine_Record {

public function setTableDefinition() {
    $this->hasColumn('item_id', 'integer', null, array(
        'primary' => true
    ));
    $this->hasColumn('prueba_id', 'integer', null, array(
        'primary' => true
    ));
}
}

I just want to do a many to many relation. When I use this names:

/models/tableone.php
/models/tabletwo.php
/models/tableoneTabletwo.php

it creates the following tables with the relations.

http://i52.tinypic.com/25hpdo2.png

When I use this names:

/models/item.php
/models/prueba.php
/models/itemPrueba.php

it creates the tables without any relations

more info: I am using codeIgniter framework and added Doctrine 1.2 as a plugin

Adding

$this->setTableName('tablename');

should do what you need. Doctrine uses some conventions to identify relations and tables. It usually guesses the name of the table based on the class but I've seen this failing many times. Setting the table name should do what you want.