diff --git a/sco_formsemestre.py b/sco_formsemestre.py
index 8b13e91..2a5db9c 100644
--- a/sco_formsemestre.py
+++ b/sco_formsemestre.py
@@ -312,8 +312,11 @@ def _write_formsemestre_aux(context, sem, fieldname, valuename):
     """fieldname: 'etapes' ou 'responsables'
     valuename: 'etape_apo' ou 'responsable_id'
     """
-    if not "etapes" in sem:
+    if not fieldname in sem:
         return
+    # uniquify
+    values = set([str(x) for x in sem[fieldname]])
+
     cnx = context.GetDBConnexion(autocommit=False)
     cursor = cnx.cursor(cursor_factory=ndb.ScoDocCursor)
     tablename = "notes_formsemestre_" + fieldname
@@ -322,7 +325,7 @@ def _write_formsemestre_aux(context, sem, fieldname, valuename):
             "DELETE from " + tablename + " where formsemestre_id = %(formsemestre_id)s",
             {"formsemestre_id": sem["formsemestre_id"]},
         )
-        for item in sem[fieldname]:
+        for item in values:
             if item:
                 cursor.execute(
                     "INSERT INTO "
@@ -332,7 +335,7 @@ def _write_formsemestre_aux(context, sem, fieldname, valuename):
                     + ") VALUES (%(formsemestre_id)s, %("
                     + valuename
                     + ")s)",
-                    {"formsemestre_id": sem["formsemestre_id"], valuename: str(item)},
+                    {"formsemestre_id": sem["formsemestre_id"], valuename: item},
                 )
     except:
         log("Warning: exception in write_formsemestre_aux !")