Ticket #23387: formset_save_as_validation.patch

django/contrib/admin/options.py

@@ -1181 +1181 @@
             'preserved_filters': self.get_preserved_filters(request),
         }
         context.update(extra_context or {})
+        if not form_validated and "_saveasnew" in request.POST:
+            return self.render_change_form(request, context, form_url=form_url, change=True)
         return self.render_change_form(request, context, form_url=form_url, add=True)
 
     @csrf_protect_m