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I need to output an existing Commerce Line Item Type field in a custom form and I can do this with a field from a standard Node but can't get it to work with Commerce Line Item types.

The code snippet that works for a Node Article is:

//Get the EntityFormDisplay (i.e. the default Form Display) of this content type
$entity_form_display = \Drupal::service('entity_type.manager')->getStorage('entity_form_display')
                                        ->load('node.article.default');

I'm trying to modify this to work for a Commerce Line Item type but $entity_form_display is always empty.

I've tried every variation of:

$entity_form_display = \Drupal::service('entity_type.manager')->getStorage('entity_form_display')
        ->load('commerce_order_item_type.commerce_order_item.default');

But the returned value is always NULL. Any ideas on what the load function is expecting, or is my issue elsewhere?

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