@umpirsky Man, you need :coffee: =)

Have a look at this line:
```diff
-                'model_transformer' => 'Sylius\Bundle\TaxonomiesBundle\Form\DataTransformer\TaxonSelectionToIdentifierCollectionTransformer',
+                'model_transformer' => 'Sylius\Bundle\ResourceBundle\Form\DataTransformer\ObjectSelectionToIdentifierCollectionTransformer',
```
Look at details =) The old code is __returned__, the __only__ change is change of __name__ in old code to new place of that code, don't ask me __why you__ put this there, not and not used the part you mentioned now =)

Feel free to send PR with tests that will prove you are right now, and was not when were writing this promotion rule config =)