diff --git a/Models/RiskObjectMapper.php b/Models/RiskObjectMapper.php
index 0d4e8ec..0a8c4f4 100644
--- a/Models/RiskObjectMapper.php
+++ b/Models/RiskObjectMapper.php
@@ -40,19 +40,6 @@ final class RiskObjectMapper extends DataMapperAbstract
         'riskmngmt_risk_object_risk'           => ['name' => 'riskmngmt_risk_object_risk',           'type' => 'int',    'internal' => 'risk'],
     ];
 
-    /**
-     * Belongs to.
-     *
-     * @var   array<string, array<string, string>>
-     * @since 1.0.0
-     */
-    protected static array $belongsTo = [
-        'unit' => [
-            'mapper' => RiskMapper::class,
-            'dest'   => 'riskmngmt_risk_object_risk',
-        ],
-    ];
-
     /**
      * Primary table.
      *