diff --git a/ereuse_devicehub/resources/lot/models.py b/ereuse_devicehub/resources/lot/models.py
index f8a9066b..9699c969 100644
--- a/ereuse_devicehub/resources/lot/models.py
+++ b/ereuse_devicehub/resources/lot/models.py
@@ -99,6 +99,10 @@ class Lot(Thing):
     def descendants(self):
         return self.descendantsq(self.id)
 
+    @property
+    def is_temporary(self):
+        return False if self.trade else True
+
     @classmethod
     def descendantsq(cls, id):
         _id = UUIDLtree.convert(id)
diff --git a/ereuse_devicehub/resources/lot/schemas.py b/ereuse_devicehub/resources/lot/schemas.py
index 72e49efe..e92de60b 100644
--- a/ereuse_devicehub/resources/lot/schemas.py
+++ b/ereuse_devicehub/resources/lot/schemas.py
@@ -26,3 +26,4 @@ class Lot(Thing):
     transfer_state = EnumField(TransferState, description=m.Lot.transfer_state.comment)
     receiver_address = SanitizedStr(validate=f.validate.Length(max=42))
     deliverynote = NestedOn(s_deliverynote.Deliverynote, dump_only=True)
+    is_temporary = f.Boolean(missing=True, data_key='isTemporary')
diff --git a/ereuse_devicehub/resources/lot/views.py b/ereuse_devicehub/resources/lot/views.py
index 295f63e1..744297b9 100644
--- a/ereuse_devicehub/resources/lot/views.py
+++ b/ereuse_devicehub/resources/lot/views.py
@@ -32,6 +32,7 @@ class LotView(View):
 
     def post(self):
         l = request.get_json()
+        l.pop('is_temporary', '')
         lot = Lot(**l)
         db.session.add(lot)
         db.session().final_flush()