unique_together does not work in django 2.0

[FernandoJMM]

Hello,
I have the following class:

==================================
class Silo(models.Model):
    nave = models.ForeignKey(Nave, on_delete=models.CASCADE)
    codSil = models.CharField(
        'Código Silo', db_index=True, max_length=2, default='01')
    notas = models.TextField(null=True, blank=True)

    def __str__(self):
        return "%s %s" % (self.nave, self.codSil)

        class Meta:
            order_with_respect_to = 'nave'
            unique_together = ('nave', 'codSil')
====================================

But the option unique_together does not work because duplicate values 
​​exist in the SQLite database for nave and codSil.

To solve it, I have to create the index nave + codSil by hand in the SQLite 
database ???

Thank you

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