diff --git a/app/Modules/Inventory/Models/InventoryTransferOrder.php b/app/Modules/Inventory/Models/InventoryTransferOrder.php
index 8a4a63a..d9cc54a 100644
--- a/app/Modules/Inventory/Models/InventoryTransferOrder.php
+++ b/app/Modules/Inventory/Models/InventoryTransferOrder.php
@@ -34,7 +34,21 @@ class InventoryTransferOrder extends Model
 
         static::creating(function ($model) {
             if (empty($model->doc_no)) {
-                $model->doc_no = 'TRF-' . date('YmdHis') . '-' . rand(100, 999);
+                $today = date('Ymd');
+                $prefix = 'TRF' . $today;
+
+                $lastDoc = static::where('doc_no', 'like', $prefix . '%')
+                    ->orderBy('doc_no', 'desc')
+                    ->first();
+
+                if ($lastDoc) {
+                    $lastNumber = substr($lastDoc->doc_no, -2);
+                    $nextNumber = str_pad((int)$lastNumber + 1, 2, '0', STR_PAD_LEFT);
+                } else {
+                    $nextNumber = '01';
+                }
+
+                $model->doc_no = $prefix . $nextNumber;
             }
         });
     }