diff --git a/modules/cmso/par/pages.py b/modules/cmso/par/pages.py
index a76e6855feabf6f29d78225fef4cf4e032240295..6fb0f5d28ca29f3e0dee6a725441e3db3f526d87 100644
--- a/modules/cmso/par/pages.py
+++ b/modules/cmso/par/pages.py
@@ -763,6 +763,10 @@ def go_order_detail(self, order):
 
     @method
     class fill_market_order(ItemElement):
+        obj_id = CleanText(
+            '//tr/td[@class="CelTitCol" and contains(text(), "Référence")]/following-sibling::td[1]',
+            default=NotAvailable
+        )
         obj_order_type = MapIn(
             CleanText('//tr/td[@class="CelTitCol" and contains(text(), "Mention")]/following-sibling::td[1]'),
             MARKET_ORDER_TYPES,