old_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  
  
  class AbstractProduct(models.Model):
      name = models.CharField(_("Name"), max_length=128)
      description = models.TextField(_("Description"), blank=True, null=True)
      item_number = models.CharField(_("Item number"), max_length=255, unique=True)
  
      class Meta:
          abstract = True
          verbose_name = _("Product")
          verbose_name_plural = _("Products")
          ordering = ['name']
  
      def __unicode__(self):
          return "%s (%s)" % (self.name, self.item_number)
  
  
new_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  
  
  class AbstractProduct(models.Model):
      item_number = models.CharField(_("Item number"), max_length=255, unique=True)
      name = models.CharField(_("Name"), max_length=128)
      description = models.TextField(_("Description"), blank=True, null=True)
  
      class Meta:
          abstract = True
          verbose_name = _("Product")
          verbose_name_plural = _("Products")
          ordering = ['item_number']
  
      def __unicode__(self):
          return "%s (%s)" % (self.name, self.item_number)
  
  
subject: change field order