Hi Folks,
I have the class below and am getting the error in the title. I have read other posts about this, but the problem does not seem related to the $searchable_fields array as you can see from the code:

The full error is

Error at sapphire/core/model/DataObject.php line 2492: Uncaught Exception: Unable to traverse to related object field [CDSEquivalent] on [SiennaEmploymentStatusCategory

class SiennaEducationalStatusCategory extends SiennaViewableData { //which extends DataObject
	
	public static $db = array (
			'EducationalStatusCategory' => 'Varchar(255)',
			'EducationalStatusCategoryDetails' => 'HTMLText',
			
			);
	
	public static $has_one = array (
			'CDSEquivalent' => 'SiennaCDSCategory',
			);
	
	//public static $has_many = array (
	//		'EducationalStatusRecords' => 'SiennaEducationalStatus',
	//		);
	
	public static $searchable_fields = array (
			'ID',
			'EducationalStatusCategory',
			'EducationalStatusCategoryDetails'
			);
	
	public static $summary_fields = array (
			'ID',
			'EducationalStatusCategory',
			'EducationalStatusCategoryDetails',
			);
	
	public static $singular_name = 'Education Status Category'; 
}

Please help!!

Never mind. I was not reading the error messages closely enough. The error was the same as has been posted about before.

The comments to DataObject (line 2492) also explain the correct syntax if you with to include a $has_one field in a $searchable_fields array.