Added hasMany relation on model files and Updated report filter functionality (and plant order by code) on resource file

app/Models/Plant.php

@@ -93,6 +93,11 @@ class Plant extends Model
         return $this->hasMany(ProcessOrder::class);
     }
 
+    public function productCharacteristicsMasters()
+    {
+        return $this->hasMany(ProductCharacteristicsMaster::class);
+    }
+
     public function equipmentMasters()
     {
         return $this->hasMany(EquipmentMaster::class, 'plant_id', 'id');