diff --git a/pyaedt/application/Design.py b/pyaedt/application/Design.py
index c587e4a0f07..90d34fc41df 100644
--- a/pyaedt/application/Design.py
+++ b/pyaedt/application/Design.py
@@ -4020,14 +4020,10 @@ def set_temporary_directory(self, temp_dir_path):
         self.odesktop.SetTempDirectory(temp_dir_path)
         return True
 
-    @pyaedt_function_handler()
-    def _manipulate_design_settings_inputs(self, k, v):
-        return v
-
     @property
     def design_settings(self):
         """Design settings for the AEDT app."""
-        return DesignSettings(self, self._manipulate_design_settings_inputs)
+        return DesignSettings(self)
 
 
 class DesignSettings:
@@ -4039,9 +4035,9 @@ class DesignSettings:
     >>> oDesign.GetChildObject("Design Settings")
     """
 
-    def __init__(self, app, manipulate_inputs):
+    def __init__(self, app):
         self._app = app
-        self._manipulate_inputs = manipulate_inputs
+        self.manipulate_inputs = None
         try:
             self.design_settings = self._app.odesign.GetChildObject("Design Settings")
         except GrpcApiError:  # pragma: no cover
@@ -4062,7 +4058,7 @@ def __repr__(self):
 
     def __setitem__(self, key, value):
         if key in self.available_properties:
-            value = self._manipulate_inputs(key, value)
+            value = self.manipulate_inputs.execute(key, value)
             key_choices = "{}/Choices".format(key)
             if key_choices in self.design_settings.GetPropNames():
                 value_choices = self.design_settings.GetPropValue(key_choices)
diff --git a/pyaedt/icepak.py b/pyaedt/icepak.py
index 07f9b08d253..f85b288f210 100644
--- a/pyaedt/icepak.py
+++ b/pyaedt/icepak.py
@@ -175,6 +175,7 @@ def __init__(
         )
         self._monitor = Monitor(self)
         self._configurations = ConfigurationsIcepak(self)
+        self.design_settings.manipulate_inputs = IcepakDesignSettingsManipulation()
 
     def _init_from_design(self, *args, **kwargs):
         self.__init__(*args, **kwargs)
@@ -6425,8 +6426,9 @@ def create_square_wave_transient_assignment(self, on_value, initial_time_off, on
         """
         return SquareWaveDictionary(on_value, initial_time_off, on_time, off_time, off_value)
 
-    @pyaedt_function_handler()
-    def _manipulate_design_settings_inputs(self, k, v):
+
+class IcepakDesignSettingsManipulation:
+    def execute(self, k, v):
         if k in ["AmbTemp", "AmbRadTemp"]:
             if k == "AmbTemp" and isinstance(v, (dict, BoundaryDictionary)):
                 self.logger.error("Failed. Use `edit_design_settings` function.")