diff --git a/schemas/documents/shared/ecologicalCreditCard.js b/schemas/documents/shared/ecologicalCreditCard.js
index 399a312..437ac0f 100644
--- a/schemas/documents/shared/ecologicalCreditCard.js
+++ b/schemas/documents/shared/ecologicalCreditCard.js
@@ -28,6 +28,12 @@ export default {
       to: [{ type: 'creditType' }],
       validation: Rule => Rule.required(),
     },
+    {
+      title: 'CreditClass',
+      name: 'creditClass',
+      type: 'reference',
+      to: [{ type: 'creditClass' }],
+    },
     {
       title: 'Credit Infos',
       name: 'creditInfos',