issue #0002080: Attempt to remove FEM analysis result (displacement & stress) results in false warning

src/Gui/ViewProviderDocumentObject.cpp

@@ -35,7 +35,8 @@
 /// Here the FreeCAD includes sorted by Base,App,Gui......
 #include <Base/Console.h>
 #include <App/Material.h>
-#include <App/DocumentObject.h>
+#include <App/DocumentObjectGroup.h>
+#include <App/Origin.h>
 #include "Application.h"
 #include "Document.h"
 #include "Selection.h"
@@ -286,6 +287,16 @@ void ViewProviderDocumentObject::setActiveMode()
         ViewProvider::hide();
 }
 
+bool ViewProviderDocumentObject::canDelete(App::DocumentObject* obj) const
+{
+    Q_UNUSED(obj)
+    if (getObject()->hasExtension(App::GroupExtension::getExtensionClassTypeId()))
+        return true;
+    if (getObject()->isDerivedFrom(App::Origin::getClassTypeId()))
+        return true;
+    return false;
+}
+
 PyObject* ViewProviderDocumentObject::getPyObject()
 {
     if (!pyViewObject)