diff --git a/sources/AppBundle/Accounting/Model/InvoicingDetail.php b/sources/AppBundle/Accounting/Model/InvoicingDetail.php
index 2afc5f791..128b7f63a 100644
--- a/sources/AppBundle/Accounting/Model/InvoicingDetail.php
+++ b/sources/AppBundle/Accounting/Model/InvoicingDetail.php
@@ -16,7 +16,7 @@ class InvoicingDetail implements NotifyPropertyInterface
     private ?int $invoicingId = null;
 
     #[Assert\NotBlank]
-    #[Assert\Length(max: 20)]
+    #[Assert\Length(max: 50)]
     private ?string $reference = null;
 
     #[Assert\NotBlank]