From a4c77789ef7886cf89a62f55383155a3d1c54695 Mon Sep 17 00:00:00 2001
From: mpv <mpv@opencascade.com>
Date: Thu, 16 Apr 2015 17:13:26 +0300
Subject: [PATCH] Fix for issue #464

---
 src/Model/Model_Document.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Model/Model_Document.cpp b/src/Model/Model_Document.cpp
index ec0c236f6..c2321d59b 100644
--- a/src/Model/Model_Document.cpp
+++ b/src/Model/Model_Document.cpp
@@ -1300,6 +1300,9 @@ void Model_Document::updateResults(FeaturePtr theFeature)
           break;
         } else if (aGroup->Get() == ModelAPI_ResultGroup::group().c_str()) {
           aNewBody = createGroup(theFeature->data(), aResIndex);
+        } else if (aGroup->Get() == ModelAPI_ResultParameter::group().c_str()) {
+          theFeature->attributeChanged("expression"); // just produce a value
+          break;
         } else {
           Events_Error::send(std::string("Unknown type of result is found in the document:") +
             TCollection_AsciiString(aGroup->Get()).ToCString());
-- 
2.39.2