I have added an Entity Reference field to a Commerce : Product Type that uses the Inline Entity Form widget. The reference is to the Bookable Unit Type bundle that is created by the Rooms (more specifically, the Rooms Unit module which comes with Rooms).
I have attempted to add the following to
$entity_info['rooms_unit_type']['inline entity form'] = array( 'controller' => 'CommerceLineItemInlineEntityFormController', );
The entity reference form never shows when creating new or editing a product. If I use the autocomplete widget, I am able to select an entity (although that does me no good).
Thanks for any help.