Flag indicating whether the field is available for editing.
If TRUE, some actions not available though the UI (but are still possible
through direct API manipulation):
- field settings cannot be changed,
 
- new instances cannot be created
 
- existing instances cannot be deleted.
 
Defaults to FALSE.
  Type: bool
File
 
   - drupal/core/modules/field/lib/Drupal/field/Plugin/Core/Entity/Field.php, line 144
 
  - Contains \Drupal\field\Plugin\Core\Entity\Field.
 
  Class
  
  - Field 
 
  - Defines the Field entity.
 
  Namespace
  Drupal\field\Plugin\Core\Entity
Code
public $locked = FALSE;