[SOLVED] How to remove a Symfony service? (Sonata Classification)

I'm using SonataAdminBundle with MediaBundle that has a dependency on ClassificationBundle. By default, ClassificationBundle adds in backend admin management for categories, tags, collections and contexts, but since my application doesn't use them I want to remove them from the menu and admin panel.

I've never removed a service before, so I don't know how to do it.

There has to be a way to remove these services from SonataClassificationBundle/Resources/config/admin.xml, obviously without modifying the file itself because it is a vendor file.

 <services>
        <service id="sonata.classification.admin.category" class="%sonata.classification.admin.category.class%">
            <tag name="sonata.admin" manager_type="orm" group="sonata_classification" label="label_categories"  label_catalogue="%sonata.classification.admin.category.translation_domain%" label_translator_strategy="sonata.admin.label.strategy.underscore" />
            <argument />
            <argument>%sonata.classification.admin.category.entity%</argument>
            <argument>%sonata.classification.admin.category.controller%</argument>
            <argument type="service" id="sonata.classification.manager.context" />

            <call method="setTranslationDomain">
                <argument>%sonata.classification.admin.category.translation_domain%</argument>
            </call>

            <call method="setTemplates">
                <argument type="collection">
                    <argument key="list">SonataClassificationBundle:CategoryAdmin:list.html.twig</argument>
                </argument>
            </call>
        </service>

        <service id="sonata.classification.admin.tag" class="%sonata.classification.admin.tag.class%">
            <tag name="sonata.admin" manager_type="orm" group="sonata_classification" label="label_tags"  label_catalogue="%sonata.classification.admin.tag.translation_domain%" label_translator_strategy="sonata.admin.label.strategy.underscore" />
            <argument />
            <argument>%sonata.classification.admin.tag.entity%</argument>
            <argument>%sonata.classification.admin.tag.controller%</argument>

            <call method="setTranslationDomain">
                <argument>%sonata.classification.admin.tag.translation_domain%</argument>
            </call>
        </service>

        <service id="sonata.classification.admin.collection" class="%sonata.classification.admin.collection.class%">
            <tag name="sonata.admin" manager_type="orm" group="sonata_classification" label="label_collections"  label_catalogue="%sonata.classification.admin.collection.translation_domain%" label_translator_strategy="sonata.admin.label.strategy.underscore" />
            <argument />
            <argument>%sonata.classification.admin.collection.entity%</argument>
            <argument>%sonata.classification.admin.collection.controller%</argument>

            <call method="setTranslationDomain">
                <argument>%sonata.classification.admin.collection.translation_domain%</argument>
            </call>
        </service>

        <service id="sonata.classification.admin.context" class="%sonata.classification.admin.context.class%">
            <tag name="sonata.admin" manager_type="orm" group="sonata_classification" label="label_contexts"  label_catalogue="%sonata.classification.admin.context.translation_domain%" label_translator_strategy="sonata.admin.label.strategy.underscore" />
            <argument />
            <argument>%sonata.classification.admin.context.entity%</argument>
            <argument>%sonata.classification.admin.context.controller%</argument>

            <call method="setTranslationDomain">
                <argument>%sonata.classification.admin.context.translation_domain%</argument>
            </call>
        </service>
    </services>

Or maybe is there a way to remove them from the Sonata admin pool? Since they are tagged with sonata.admin?

EDIT

Using Sonata Easy Extends I've extended the bundle and added a Compiler Pass:

class ApplicationSonataClassificationBundle extends Bundle
{
    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return 'SonataClassificationBundle';
    }

    public function build(ContainerBuilder $container)
    {
        parent::build($container);

        $container->addCompilerPass(new CustomCompilerPass());
    }

}

The compiler pass looks like this

class CustomCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        $container->removeDefinition('sonata.classification.admin.category');
    }
}

But I'm getting

  You have requested a non-existent service "sonata.classification.admin.cate  
  gory" in . (which is being imported from "E:\svn\parkresort\app/config\rout  
  ing/sonata.yml").

That file is importing the routing for the whole sonata bundle

admin:
    resource: '@SonataAdminBundle/Resources/config/routing/sonata_admin.xml'
    prefix: /admin

_sonata_admin:
    resource: .
    type: sonata_admin
    prefix: /admin

#sonata media
media:
    resource: '@SonataMediaBundle/Resources/config/routing/media.xml'
    prefix: /media

I guess the service is being used by sonata admin even after being removed from the container. How can I change that?

EDIT2

I did it! I had to put the Compiler Pass in Sonata Admin Extension(with its namespace) and not in Sonata Media. Also extending the Admin bundle, obviously. Worked just fine afterwards.

What I don't really understand is why it works when the original bundle is loaded after my extended bundle:

//AppKernel.php
new ApplicationSonataAdminBundle(),//extended
new Sonata\AdminBundle\SonataAdminBundle(),

That is strange.