diff --git a/app/Models/Line.php b/app/Models/Line.php
index ed9c69a..377e11d 100644
--- a/app/Models/Line.php
+++ b/app/Models/Line.php
@@ -156,6 +156,11 @@ class Line extends Model
         return $this->hasMany(Machine::class);
     }
 
+    public function productCharacteristicsMasters()
+    {
+        return $this->hasMany(ProductCharacteristicsMaster::class);
+    }
+
     // public function rejectReasons()
     // {
     //     return $this->hasMany(RejectReason::class, 'line_id', 'id');