diff --git a/product/Coramy/Document/OrderLine.py b/product/Coramy/Document/OrderLine.py
index f7d280b5a5cfd2e4f7ca7744dfd9a05c64107a74..88a950a8fab41fa69e5178aecb4ca0f5e9715446 100755
--- a/product/Coramy/Document/OrderLine.py
+++ b/product/Coramy/Document/OrderLine.py
@@ -133,4 +133,4 @@ Une ligne tarifaire."""
         """
         # Temp fix until upgrade of Variated XXX
         # XXX - may be incompatible with future versions of ERP5
-        return self.variation_base_category_list
+        return list(self.variation_base_category_list)