diff --git a/app/Models/Machine.php b/app/Models/Machine.php
index 4caf091..f584c02 100644
--- a/app/Models/Machine.php
+++ b/app/Models/Machine.php
@@ -48,6 +48,11 @@ class Machine extends Model
         return $this->hasMany(ClassCharacteristic::class, 'machine_id', 'id');
     }
 
+    public function ModelMasters()
+    {
+        return $this->hasMany(ModelMaster::class, 'machine_id', 'id');
+    }
+
     public function windedSerialValidationErrors()
     {
         return $this->hasMany(WindedSerialValidationError::class, 'machine_id', 'id');
diff --git a/app/Models/Plant.php b/app/Models/Plant.php
index 58a6ed0..bc94564 100644
--- a/app/Models/Plant.php
+++ b/app/Models/Plant.php
@@ -164,10 +164,10 @@ class Plant extends Model
         return $this->hasMany(ClassCharacteristic::class, 'plant_id', 'id');
     }
 
-    // public function ModelMasters()
-    // {
-    //     return $this->hasMany(ModelMaster::class, 'plant_id', 'id');
-    // }
+    public function ModelMasters()
+    {
+        return $this->hasMany(ModelMaster::class, 'plant_id', 'id');
+    }
 
     public function windedSerialValidationErrors()
     {