diff --git a/conditor-dumps/02-download.ini b/conditor-dumps/02-download.ini
index 770cb16..88db004 100644
--- a/conditor-dumps/02-download.ini
+++ b/conditor-dumps/02-download.ini
@@ -51,6 +51,11 @@
 value = get("enrichments.rnsr", []) \
         .filter(rnsr => !["200612821P", "200018571R", "199812965F", "201523784S"].includes(rnsr))
 
+# Garde un identifiant
+[assign]
+path = sourceUidChain
+value = get("business.sourceUidChain")
+
 # Supprime les champs inutiles pour les études bibliométriques
 [exchange]
 value = omit(['business','origins','technical'])
diff --git a/conditor-dumps/README.md b/conditor-dumps/README.md
index 5f2de79..e3f6e5f 100644
--- a/conditor-dumps/README.md
+++ b/conditor-dumps/README.md
@@ -28,6 +28,8 @@
   199812965F, 201523784S).
 
 > Note: l'étape 03 a été intégrée à l'étape 2.
+>
+> Note 2: on préserve le champ `sourceUidChain` à la racine de la notice.
 
 ### 04-enrich