diff --git a/data-computer/v1/graph-segment.ini b/data-computer/v1/graph-segment.ini
index d9990a9..27a9abb 100644
--- a/data-computer/v1/graph-segment.ini
+++ b/data-computer/v1/graph-segment.ini
@@ -35,6 +35,15 @@
 [delegate]
 file = charger.cfg
 
+# Step 1.1 (spécifique): Controle du premier element en supposant que les autres lui ressemblent
+[singleton]
+[singleton/validate]
+path = id
+rule = required|string
+
+path = value
+rule = required|array
+
 # Step 2 (générique): Traiter de manière asynchnore les items reçus
 [fork]
 standalone = true
diff --git a/data-computer/v1/tree-segment.ini b/data-computer/v1/tree-segment.ini
index e2ac6f6..51fb0c7 100644
--- a/data-computer/v1/tree-segment.ini
+++ b/data-computer/v1/tree-segment.ini
@@ -35,6 +35,15 @@
 [delegate]
 file = charger.cfg
 
+# Step 1.1 (spécifique): Controle du premier element en supposant que les autres lui ressemblent
+[singleton]
+[singleton/validate]
+path = id
+rule = required|string
+
+path = value
+rule = required|array
+
 # Step 2 (générique): Traiter de manière asynchnore les items reçus
 [fork]
 standalone = true