// Fix #PSCFV-4543

classes/order/OrderDetail.php

@@ -318,7 +318,7 @@ class OrderDetailCore extends ObjectModel
 	 * @since 1.5.0.1
 	 * @return boolean
 	 */
-	public function saveTaxCalculator(Order $order)
+	public function saveTaxCalculator(Order $order, $replace = false)
 	{
 		// Nothing to save
 		if ($this->tax_calculator == null)
@@ -345,6 +345,9 @@ class OrderDetailCore extends ObjectModel
 			$values .= '('.(int)$this->id.','.(float)$id_tax.','.$unit_amount.','.(float)$total_amount.'),';
 		}
 
+		if ($replace)
+			Db::getInstance()->execute('DELETE FROM `'._DB_PREFIX_.'order_detail_tax` WHERE id_order_detail='.(int)$this->id);
+			
 		$values = rtrim($values, ',');
 		$sql = 'INSERT INTO `'._DB_PREFIX_.'order_detail_tax` (id_order_detail, id_tax, unit_amount, total_amount)
 				VALUES '.$values;
@@ -352,6 +355,16 @@ class OrderDetailCore extends ObjectModel
 		return Db::getInstance()->execute($sql);
 	}
 	
+	public function updateTaxAmount($order)
+	{
+		$this->setContext((int)$this->id_shop);
+		$address = new Address((int)($order->{Configuration::get('PS_TAX_ADDRESS_TYPE')}));
+		$tax_manager = TaxManagerFactory::getManager($address, (int)Product::getIdTaxRulesGroupByIdProduct((int)$this->product_id, $this->context));
+		$this->tax_calculator = $tax_manager->getTaxCalculator();
+
+		return $this->saveTaxCalculator($order, true);
+	}
+
 	/**
 	 * Get a detailed order list of an id_order
 	 * @param int $id_order

controllers/admin/AdminOrdersController.php

@@ -1821,10 +1821,10 @@ class AdminOrdersControllerCore extends AdminController
 		// Return value
 		$res = true;
 
-		$order = new Order(Tools::getValue('id_order'));
+		$order = new Order((int)Tools::getValue('id_order'));
-		$order_detail = new OrderDetail(Tools::getValue('product_id_order_detail'));
+		$order_detail = new OrderDetail((int)Tools::getValue('product_id_order_detail'));
 		if (Tools::isSubmit('product_invoice'))
-			$order_invoice = new OrderInvoice(Tools::getValue('product_invoice'));
+			$order_invoice = new OrderInvoice((int)Tools::getValue('product_invoice'));
 
 		// Check fields validity
 		$this->doEditProductValidation($order_detail, $order, isset($order_invoice) ? $order_invoice : null);
@@ -1908,6 +1908,10 @@ class AdminOrdersControllerCore extends AdminController
 		$old_quantity = $order_detail->product_quantity;
 
 		$order_detail->product_quantity = $product_quantity;
+		
+		// update taxes
+		$res &= $order_detail->updateTaxAmount($order);
+	
 		// Save order detail
 		$res &= $order_detail->update();
 		// Save order invoice