@ -28,7 +28,7 @@ class Bill(models.Model):
return '%s: %s' % (self.id, self.user)
def freeze_course(self, user):
if self.invoice_set.exclude('F').exists():
if self.invoice_set.exclude(status='F').exists():
try:
p = Progress.objects.get(user=user, course_token=self.course_token)
p.freeze = True