app/Models/Machine.php

@@ -38,6 +38,11 @@ class Machine extends Model
         return $this->hasMany(ProductCharacteristicsMaster::class);
     }
 
+    public function characteristicValues()
+    {
+        return $this->hasMany(CharacteristicValue::class);
+    }
+
     public function testingPanelReadings()
     {
         return $this->hasMany(TestingPanelReading::class);