diff --git a/app/Models/Item.php b/app/Models/Item.php
index bfba54e861..c23546ed7a 100644
--- a/app/Models/Item.php
+++ b/app/Models/Item.php
@@ -129,4 +129,9 @@ class Item extends Model
     {
         return $this->hasMany(CoilPacking::class, 'item_id', 'id');
     }
+
+    public function productionTemp()
+    {
+        return $this->hasMany(ProductionTemp::class, 'item_id', 'id');
+    }
 }
diff --git a/app/Models/Plant.php b/app/Models/Plant.php
index 201723022b..96de552768 100644
--- a/app/Models/Plant.php
+++ b/app/Models/Plant.php
@@ -238,4 +238,9 @@ class Plant extends Model
     {
         return $this->hasMany(CoilPacking::class, 'plant_id', 'id');
     }
+
+    public function productionTemp()
+    {
+        return $this->hasMany(ProductionTemp::class, 'plant_id', 'id');
+    }
 }