diff --git a/app/scodoc/sco_formsemestre_inscriptions.py b/app/scodoc/sco_formsemestre_inscriptions.py
index dfeead3e..8f2c3a08 100644
--- a/app/scodoc/sco_formsemestre_inscriptions.py
+++ b/app/scodoc/sco_formsemestre_inscriptions.py
@@ -163,7 +163,12 @@ def do_formsemestre_desinscription(etudid, formsemestre_id, REQUEST=None):
     cnx = ndb.GetDBConnexion()
     cursor = cnx.cursor(cursor_factory=ndb.ScoDocCursor)
     cursor.execute(
-        "select moduleimpl_inscription_id from notes_moduleimpl_inscription Im, notes_moduleimpl M  where Im.etudid=%(etudid)s and Im.moduleimpl_id = M.moduleimpl_id and M.formsemestre_id = %(formsemestre_id)s",
+        """SELECT Im.id AS moduleimpl_inscription_id 
+        FROM notes_moduleimpl_inscription Im, notes_moduleimpl M  
+        WHERE Im.etudid=%(etudid)s 
+        and Im.moduleimpl_id = M.id 
+        and M.formsemestre_id = %(formsemestre_id)s
+        """,
         {"etudid": etudid, "formsemestre_id": formsemestre_id},
     )
     res = cursor.fetchall()
diff --git a/app/scodoc/sco_pdf.py b/app/scodoc/sco_pdf.py
index bed6ff31..3d3799c8 100755
--- a/app/scodoc/sco_pdf.py
+++ b/app/scodoc/sco_pdf.py
@@ -371,19 +371,40 @@ class PDFLock(object):
         log("PDFLock: granted to %s" % self.current_thread)
 
 
+class WatchLock:
+    "Surveille threads (mais ne verrouille pas)"
+
+    def __init__(self, timeout=None):
+        self.timeout = timeout
+        t = threading.current_thread()
+        self.native_id = t.native_id
+        self.ident = t.ident
+
+    def acquire(self):
+        t = threading.current_thread()
+        if (self.native_id != t.native_id) or (self.ident != t.ident):
+            log(
+                f"Warning: LOCK detected several threads ! (native_id {self.native_id} -> {t.native_id}, ident {self.ident} -> {t.ident}"
+            )
+        self.native_id = t.native_id
+        self.ident = t.ident
+
+    def release(self):
+        t = threading.current_thread()
+        assert (self.native_id == t.native_id) and (self.ident == t.ident)
+        pass
+
+
 class FakeLock:
     "Pour ScoDoc 9: pas de verrou"
 
-    def __init__(self, timeout=15):
-        self.timeout = timeout
-        self.current_thread = threading.get_ident()
+    def __init__(self, timeout=None):
+        pass
 
     def acquire(self):
-        assert threading.get_ident() == self.current_thread
         pass
 
     def release(self):
-        assert threading.get_ident() == self.current_thread
         pass
 
 
diff --git a/app/views/notes.py b/app/views/notes.py
index 307c8b69..a324f433 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -1289,7 +1289,7 @@ def do_formsemestre_inscription_listinscrits(
     return scu.sendResult(REQUEST, r, format=format, name="inscrits")
 
 
-@bp.route("/formsemestre_desinscription")
+@bp.route("/formsemestre_desinscription", methods=["GET", "POST"])
 @scodoc
 @permission_required(Permission.ScoImplement)
 @scodoc7func
@@ -1373,6 +1373,7 @@ sco_publish(
     "/do_formsemestre_desinscription",
     sco_formsemestre_inscriptions.do_formsemestre_desinscription,
     Permission.ScoEtudInscrit,
+    methods=["GET", "POST"],
 )