diff --git a/odoo/addons/test_new_api/tests/test_new_fields.py b/odoo/addons/test_new_api/tests/test_new_fields.py
index 4a82cb355ac..db0110199f7 100644
--- a/odoo/addons/test_new_api/tests/test_new_fields.py
+++ b/odoo/addons/test_new_api/tests/test_new_fields.py
@@ -1681,6 +1681,22 @@ class TestFields(TransactionCaseWithUserDemo):
         self.assertNotEqual(new_disc.participants, disc.participants)
         self.assertEqual(new_disc.participants._origin, disc.participants)
 
+        # provide many2one field as a dict of values; the value is a new record
+        # with the given 'id' as origin (if given, of course)
+        new_msg = disc.messages.new({
+            'discussion': {'name': disc.name},
+        })
+        self.assertTrue(new_msg.discussion)
+        self.assertFalse(new_msg.discussion.id)
+        self.assertFalse(new_msg.discussion._origin)
+
+        new_msg = disc.messages.new({
+            'discussion': {'name': disc.name, 'id': disc.id},
+        })
+        self.assertTrue(new_msg.discussion)
+        self.assertFalse(new_msg.discussion.id)
+        self.assertEqual(new_msg.discussion._origin, disc)
+
         # check convert_to_write
         tag = self.env['test_new_api.multi.tag'].create({'name': 'Foo'})
         rec = self.env['test_new_api.multi'].create({
diff --git a/odoo/fields.py b/odoo/fields.py
index 664c49e50ab..07c789847ee 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -2748,7 +2748,10 @@ class Many2one(_Relational):
             # value is either a pair (id, name), or a tuple of ids
             id_ = value[0] if value else None
         elif isinstance(value, dict):
-            id_ = record.env[self.comodel_name].new(value).id
+            # return a new record (with the given field 'id' as origin)
+            comodel = record.env[self.comodel_name]
+            origin = comodel.browse(value.get('id'))
+            id_ = comodel.new(value, origin=origin).id
         else:
             id_ = None