onValidationFails through related records

Hi all

Note: I'm using v2.0.13

I have a case where i use the method onValidationFails() in a model, which is created through a relation. So the conceptual case is:

<?php

class Robots extends Model

public function initialize()
    {
        $this->hasMany(
            "id",
            "RobotsParts",
            "robots_id"
        );
    }

<?php

class RobotsParts extends Model

public function initialize()
    $this->belongsTo(
                "robots_id",
                "Robots",
                "id"
            );
        }

public function validation()
{
    // Some validation
}

public function onValidationFails()
{
    $Setting = new SettingModel();
    $Setting->var = 'test';
    $Setting->update();
}

When I create a RobotsParts through Robots and the validation in RobotsParts fails, then onValidationFails is executed and the $Setting->update() returns TRUE! The problem is that $Setting->var is not updated in the database, it seems like that everything is rolled back. When I test create a RobotParts directly as RobotParts->create() then is $Setting->var updated in the database if validation fails.

Is this behavior expected and is there a way to establish a new transaction in the model which is not affected by the roolback.

Thanks in advance