diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 00174bca730..b110596d8a7 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -698,6 +698,11 @@ class ModelAdmin(BaseModelAdmin):
         changelist; it returns an HttpResponse if the action was handled, and
         None otherwise.
         """
+        if 'index' not in request.POST:
+            # If "Go" was not pushed then we can assume the POST was for
+            # an inline edit save and we do not need to validate the form.
+            return None
+
         # There can be multiple action forms on the page (at the top
         # and bottom of the change list, for example). Get the action
         # whose button was pushed.
diff --git a/tests/regressiontests/admin_views/tests.py b/tests/regressiontests/admin_views/tests.py
index 0f6f79d85ce..199b41afcb9 100644
--- a/tests/regressiontests/admin_views/tests.py
+++ b/tests/regressiontests/admin_views/tests.py
@@ -940,6 +940,28 @@ class AdminViewListEditable(TestCase):
         # 1 select per object = 3 selects
         self.failUnlessEqual(response.content.count("<select"), 4)
 
+    def test_post_messages(self):
+        # Ticket 12707: Saving inline editable should not show admin
+        # action warnings
+        data = {
+            "form-TOTAL_FORMS": "3",
+            "form-INITIAL_FORMS": "3",
+            "form-MAX_NUM_FORMS": "0",
+
+            "form-0-gender": "1",
+            "form-0-id": "1",
+
+            "form-1-gender": "2",
+            "form-1-id": "2",
+
+            "form-2-alive": "checked",
+            "form-2-gender": "1",
+            "form-2-id": "3",
+        }
+        response = self.client.post('/test_admin/admin/admin_views/person/',
+                                    data, follow=True)
+        self.assertEqual(len(response.context['messages']), 1)
+
     def test_post_submission(self):
         data = {
             "form-TOTAL_FORMS": "3",