Not enabling Exception Translation with Spring Data?

According to the doc an @Repository annotation is required to activate Exception Translation:
§2.1.1 "Beyond that it activates persistence exception translation for all beans annotated with @Repository to let exceptions being thrown by the JPA presistence providers be converted into Spring's
DataAccessException hierarchy."

When I try this with a mini-example, it translates the exceptions even without @Repository:

Code:

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import org.springframework.data.jpa.repository.JpaRepository;

public interface CustomerTestRepository
        extends JpaRepository<Customer, Long> {

}

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Code:

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        <jpa:repositories base-package="...jpa.test" />

        <tx:annotation-driven transaction-manager="transactionManager" />

    <!-- just basic entityManagerFactory, transactionManager, ... -->

---

The following test fails:

Code:

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@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath*:test-root-context.xml" })
public class SpringDataExceptionTranslationTest {

    @Autowired
    CustomerTestRepository cr;

    @Test
    public void testOptimisticLockingException() {
        try {
            Customer c = cr.save(new Customer("a", "Hans", "Muster", 1.3));
            c.setVersion(c.getVersion() - 1); // try provoking an optimstic locking exception

            cr.save(c);

            Assert.fail("should have thrown an exception");
        } catch (OptimisticLockingFailureException dae) {
            Assert.fail("should not throw a SPRING optimistic locking exception");
        } catch (OptimisticLockException ole) {
            // expected
        }
    }

}

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I also tried to fake the exception translator with:

Code:

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<bean id="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor#0"
    class="java.lang.String" />

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But it dit not help either.