title: Django Model " has more than one ForeignKey to "
body: <p>there are two Models, <code>User</code> And <code>Friends</code>. I want to make two users make friends,but it did work.</p>
  
  <p>the console just said,</p>
  
  <blockquote>
    <p>django.core.management.base.CommandError: System check identified some issues:</p>
    
    <p>ERRORS:
    : (admin.E202) 'api4android.Friends' has more than one ForeignKey to 'api4android.User'.</p>
  </blockquote>
  
  <p>here is the code </p>
  
  <pre><code>class Friends(models.Model):
      user = models.ForeignKey(User, null=True, related_name='user')
      friend = models.ForeignKey(User, null=True, related_name='friend')
      note_name = models.CharField(max_length=20)
  
  def __str__(self):  
      return self.note_name
  </code></pre>
  
  <p>hope my poor english makes you understand what i mean.</p>