[Flow] PeristenceManager->remove() ends up in integrity constraints violation exception

[Carsten Bleicker]

I dont get it :(
Shouldnt "detach" automaticaly release relations on delete?
Instead of this i am runnig in an exception:

SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`bleicker_sale_development`.`bleicker_sale_domain_model_company`, CONSTRAINT `FK_20EA261F2B5A4883` FOREIGN KEY (`postaladdress`) REFERENCES `bleicker_sale_domain_model_postaladdress` (`persist)

There is also a doctrine annotation "refresh" but it also has no effect.
Releasing the relation from Company->PostalAddress inside of the deletePostalAddressAction works.
But is this realy a proof concept? How do you solve this?

If the code doesnt get displayed well formated it is also available here:
https://gist.github.com/pumatertion/05424c2541c9d8ec8bba


// PostalAddress
class PostalAddress{
	/**
	 * @var \Doctrine\Common\Collections\Collection<\BLEICKER\Sale\Domain\Model\Company>
	 * @ORM\OneToMany(mappedBy="postalAddress",cascade={"detach", "merge", "remove"})
	 * @ORM\OrderBy({"name" = "ASC"})
	 */
	protected $companies;
}

// Company
class Company extends AbstractManufacturer {
	/**
	 * @var PostalAddress
	 * @ORM\Column(nullable=true)
	 * @ORM\ManyToOne(cascade={"persist", "detach", "merge"})
	 */
	protected $postalAddress;
}


// PostalAddressController running in exception
class PostalAddressController{

	/**
	 * @param PostalAddress $postalAddress
	 * @return void
	 */
	public function deleteAction(PostalAddress $postalAddress) {
		$this->persistenceManager->remove($postalAddress);
		$this->addFlashMessage('Postal address deleted', Message::SEVERITY_OK, Message::SEVERITY_OK, array(), 1387120896);
		$this->redirect('index');
	}

}

// PostalAddressController NOT running in exception
class PostalAddressController{
	/**
	 * @param PostalAddress $postalAddress
	 * @return void
	 */
	public function deleteAction(PostalAddress $postalAddress) {
		$companyIterator = $postalAddress->getCompanies()->getIterator();
		while ($companyIterator->valid()) {
			/**
			 * @var Company $company
			 */
			$company = $companyIterator->current();
			$company->setPostalAddress();
			$this->persistenceManager->update($company);
			$this->addFlashMessage('Postal address removed from company "' . $company->getName() . '"', Message::SEVERITY_WARNING, Message::SEVERITY_WARNING, array(), 1387120895);
			$companyIterator->next();
		}
		$postalAddress->getCompanies()->clear();
		$this->persistenceManager->remove($postalAddress);
		$this->persistenceManager->persistAll();
		$this->addFlashMessage('Postal address deleted', Message::SEVERITY_OK, Message::SEVERITY_OK, array(), 1387120896);
		$this->redirect('index');
	}
}