将django从1.9升级到1.11：反向访问冲突

Question

models.py：

class Societe(models.Model):
    ...

class Client(Societe):
    ...
    class Meta(Societe.Meta):
        proxy = True

class Fournisseur(Societe):
    ...
    class Meta(Societe.Meta):
        proxy = True

class Commande(models.Model):
    Client = models.ForeignKey(Client, related_name='Commandes')
    Fournisseur = models.ForeignKey(Fournisseur, related_name='Commandes')

这适用于Django 1.9，但在1.11中，我收到错误：

Commande.Client: (fields.E304) Reverse accessor for 'Commande.Client' clashes with reverse accessor for 'Commande.Fournisseur'.
Commande.Client: (fields.E305) Reverse query name for 'Commande.Client' clashes with reverse query name for 'Commande.Fournisseur'.
Commande.Fournisseur: (fields.E304) Reverse accessor for 'Commande.Fournisseur' clashes with reverse accessor for 'Commande.Client'.
Commande.Fournisseur: (fields.E305) Reverse query name for 'Commande.Fournisseur' clashes with reverse query name for 'Commande.Client'.

Django似乎认为Client和Fournisseur是相同的模型。 我不想改变相关的名字，知道如何解决这个问题吗？