diff --git a/src/Picqer/Financials/Moneybird/Entities/Generic/InvoiceDetail.php b/src/Picqer/Financials/Moneybird/Entities/Generic/InvoiceDetail.php
index ee37e6a..20df06a 100644
--- a/src/Picqer/Financials/Moneybird/Entities/Generic/InvoiceDetail.php
+++ b/src/Picqer/Financials/Moneybird/Entities/Generic/InvoiceDetail.php
@@ -30,6 +30,5 @@ abstract class InvoiceDetail extends Model
         'product_id',
         'project_id',
         '_destroy',
-        'project_id',
     ];
 }