diff --git a/services/nginx/app/classes/invoice_period_flag_service.php b/services/nginx/app/classes/invoice_period_flag_service.php
index 2b1f823f..2646ee4b 100644
--- a/services/nginx/app/classes/invoice_period_flag_service.php
+++ b/services/nginx/app/classes/invoice_period_flag_service.php
@@ -1495,6 +1495,7 @@ class invoice_period_flag_service
     {
         $product = (string)($params['product'] ?? 'Item');
         $expectedProduct = (string)($params['expected_product'] ?? 'expected product');
+        $washId = (string)($params['wash_id'] ?? '');
         return match ($definitionKey) {
             'price_mismatch' => "{$product} product price differs from expected.",
             'customer_rule_restrict_addon_services' => "{$product} violates restricted addon services.",
@@ -1514,7 +1515,9 @@ class invoice_period_flag_service
             'duplicate_vehicle_subscription_charge_same_month' => "Duplicate vehicle subscription charges exist in the same month.",
             'vehicle_subscription_type_mismatch' => "{$product} does not match the vehicle subscription type {$expectedProduct}.",
             'historical_primary_product_mismatch' => "{$product} differs from the registration number's usual product {$expectedProduct}.",
-            'xlvask_missing_order_link' => "XL Vask wash is neither ignored nor linked to an order in the selected period.",
+            'xlvask_missing_order_link' => $washId === ''
+                ? 'XL Vask wash is neither ignored nor linked to an order in the selected period.'
+                : "XL Vask wash {$washId} is neither ignored nor linked to an order in the selected period.",
             default => "Automatically detected invoice-period issue.",
         };
     }
@@ -1541,7 +1544,8 @@ class invoice_period_flag_service
                 ['type' => 'text', 'text' => ' is attached without a wash certificate item.'],
             ],
             'xlvask_missing_order_link' => [
-                ['type' => 'xlvask_usage_log', 'text' => 'XL Vask wash'],
+                ['type' => 'text', 'text' => 'XL Vask wash '],
+                ['type' => 'xlvask_usage_log', 'text' => (string)($params['wash_id'] ?? '')],
                 ['type' => 'text', 'text' => ' is neither ignored nor linked to an order in the selected period.'],
             ],
             default => [],
diff --git a/services/nginx/app/tests/Unit/Invoicing/InvoicePeriodFlagServiceTest.php b/services/nginx/app/tests/Unit/Invoicing/InvoicePeriodFlagServiceTest.php
index f9d1be45..d2449e66 100644
--- a/services/nginx/app/tests/Unit/Invoicing/InvoicePeriodFlagServiceTest.php
+++ b/services/nginx/app/tests/Unit/Invoicing/InvoicePeriodFlagServiceTest.php
@@ -167,7 +167,8 @@ it('builds interactive message parts for order and wash certificate warnings', f
         ['type' => 'text', 'text' => ' is present without a wash certificate.'],
     ]);
     expect($xlVaskFlag['message_parts'])->toBe([
-        ['type' => 'xlvask_usage_log', 'text' => 'XL Vask wash'],
+        ['type' => 'text', 'text' => 'XL Vask wash '],
+        ['type' => 'xlvask_usage_log', 'text' => 'wash-55'],
         ['type' => 'text', 'text' => ' is neither ignored nor linked to an order in the selected period.'],
     ]);
 });