class ProductResource(resources.ModelResource):
    class Meta:
        model = Product
        exclude = ('pub_date','modified_date',)
        import_id_fields = ('CD-SKU',)

class ProductAdmin(ImportExportModelAdmin):
        resource_class = ProductResource

Line number: 1 - u'CD-SKU'
0H041501, VOL3380235300029, 3380235300029, B00FIZJI0K, 11.59, None, None, None, None, None, None, None, None, None
Traceback (most recent call last):
File "/home/mws/Env/mws_prod/local/lib/python2.7/site-packages/import_export/resources.py", line 434, in import_row
instance, new = self.get_or_init_instance(instance_loader, row)
File "/home/mws/Env/mws_prod/local/lib/python2.7/site-packages/import_export/resources.py", line 258, in get_or_init_instance
instance = self.get_instance(instance_loader, row)
File "/home/mws/Env/mws_prod/local/lib/python2.7/site-packages/import_export/resources.py", line 252, in get_instance
return instance_loader.get_instance(row)
File "/home/mws/Env/mws_prod/local/lib/python2.7/site-packages/import_export/instance_loaders.py", line 31, in get_instance
field = self.resource.fields[key]
KeyError: u'CD-SKU'