diff --git a/app/Services/PurchaseOrder/ApplyNumber.php b/app/Services/PurchaseOrder/ApplyNumber.php
new file mode 100644
index 000000000000..c3fd4d5df078
--- /dev/null
+++ b/app/Services/PurchaseOrder/ApplyNumber.php
@@ -0,0 +1,59 @@
+<?php
+
+
+namespace App\Services\PurchaseOrder;
+
+
+use App\Models\Client;
+use App\Models\Credit;
+use App\Models\PurchaseOrder;
+use App\Services\AbstractService;
+use App\Utils\Traits\GeneratesCounter;
+use Illuminate\Database\QueryException;
+
+class ApplyNumber extends AbstractService
+{
+    use GeneratesCounter;
+
+    private Client $client;
+
+    private PurchaseOrder $purchase_order;
+
+    private bool $completed = true;
+
+    public function __construct(Client $client, PurchaseOrder $purchase_order)
+    {
+        $this->client = $client;
+
+        $this->purchase_order = $purchase_order;
+    }
+
+    public function run()
+    {
+        if ($this->purchase_order->number != '') {
+            return $this->purchase_order;
+        }
+
+        $this->trySaving();
+
+        return $this->purchase_order;
+    }
+    private function trySaving()
+    {
+        $x=1;
+        do{
+            try{
+                $this->purchase_order->number = $this->getNextPurchaseOrderNumber($this->client, $this->purchase_order);
+                $this->purchase_order->saveQuietly();
+                $this->completed = false;
+            }
+            catch(QueryException $e){
+                $x++;
+                if($x>10)
+                    $this->completed = false;
+            }
+        }
+        while($this->completed);
+
+    }
+}