diff --git a/src/Mod/Fem/App/FemConstraintInitialTemperature.cpp b/src/Mod/Fem/App/FemConstraintInitialTemperature.cpp
index 0c5f1968bb..d2ef08588b 100644
--- a/src/Mod/Fem/App/FemConstraintInitialTemperature.cpp
+++ b/src/Mod/Fem/App/FemConstraintInitialTemperature.cpp
@@ -52,6 +52,9 @@ ConstraintInitialTemperature::ConstraintInitialTemperature()
                                                                              "Normals where symbols are drawn");
     Points.setValues(std::vector<Base::Vector3d>());
     Normals.setValues(std::vector<Base::Vector3d>());
+
+    References.setStatus(App::Property::ReadOnly, true);
+    References.setStatus(App::Property::Hidden, true);
 }
 
 App::DocumentObjectExecReturn *ConstraintInitialTemperature::execute(void)
diff --git a/src/Mod/Fem/FemMeshTools.py b/src/Mod/Fem/FemMeshTools.py
index 3c484a6709..71293addeb 100644
--- a/src/Mod/Fem/FemMeshTools.py
+++ b/src/Mod/Fem/FemMeshTools.py
@@ -1050,7 +1050,8 @@ def get_analysis_group_elements(aAnalysis, aPart):
     group_elements = {}  # { name : [element, element, ... , element]}
     empty_references = []
     for m in aAnalysis.Group:
-        if hasattr(m, "References"):
+        if hasattr(m, "References") and "ReadOnly" not in m.getEditorMode("References"):  
+            # some C++ Constraints have a not used References Property, it is set to Hidden in ReadOnly and PropertyEditor
             if m.References:
                 grp_ele = get_reference_group_elements(m, aPart)
                 group_elements[grp_ele[0]] = grp_ele[1]