diff --git a/app/Models/PanelGrMaster.php b/app/Models/PanelGrMaster.php
index ad1a833..cebd0d9 100644
--- a/app/Models/PanelGrMaster.php
+++ b/app/Models/PanelGrMaster.php
@@ -31,4 +31,11 @@ class PanelGrMaster extends Model
     {
         return $this->belongsTo(Item::class);
     }
+
+    public function panelBoxValidations()
+    {
+        return $this->hasMany(PanelBoxValidation::class, 'plant_id', 'plant_id')
+            ->whereColumn('production_order', 'panel_gr_masters.document_number')
+            ->whereColumn('inspection_lot_number', 'panel_gr_masters.inspection_lot_number');
+    }
 }