diff --git a/app/Filament/Imports/CustomerPoMasterImporter.php b/app/Filament/Imports/CustomerPoMasterImporter.php
index 430f81b..bf089bf 100644
--- a/app/Filament/Imports/CustomerPoMasterImporter.php
+++ b/app/Filament/Imports/CustomerPoMasterImporter.php
@@ -17,6 +17,8 @@ class CustomerPoMasterImporter extends Importer
 {
     protected static ?string $model = CustomerPoMaster::class;
 
+    protected array $importedPos = [];
+
     public static function getColumns(): array
     {
         return [
@@ -67,6 +69,8 @@ class CustomerPoMasterImporter extends Importer
         $plantCod = $this->data['plant'];
         $plant = null;
         $item = null;
+        $customerPo = trim($this->data['customer_po']);
+        $customerName = trim($this->data['customer_name']);
 
         if (Str::length($plantCod) < 4 || ! is_numeric($plantCod) || ! preg_match('/^[1-9]\d{3,}$/', $plantCod)) {
             $warnMsg[] = 'Invalid plant code found';
@@ -90,6 +94,23 @@ class CustomerPoMasterImporter extends Importer
             $warnMsg[] = 'Customer PO cannot be empty.';
         }
 
+        if (isset($this->importedPos[$customerPo])) {
+
+            if (strtolower(trim($this->importedPos[$customerPo])) != strtolower($customerName)){
+                $warnMsg[] = "Customer PO '{$customerPo}' has multiple customer names in the import file.";
+            }
+        }
+        else {
+            $this->importedPos[$customerPo] = $customerName;
+        }
+
+        $existingPo = CustomerPoMaster::where('plant_id', $plant->id)->where('customer_po', $this->data['customer_po'])->first();
+
+        if ($existingPo && trim(strtolower($existingPo->customer_name)) != trim(strtolower($this->data['customer_name'])))
+        {
+            $warnMsg[] =  "Customer PO '{$this->data['customer_po']}' is already mapped to customer '{$existingPo->customer_name}'.";
+        }
+
         // $user = User::where('name', $this->data['created_by'])->first();
         // if (! $user) {
         //     $warnMsg[] = 'User not found';