diff --git a/src/pyedb/grpc/edb.py b/src/pyedb/grpc/edb.py
index 384e5e3691..e2b6423571 100644
--- a/src/pyedb/grpc/edb.py
+++ b/src/pyedb/grpc/edb.py
@@ -2662,10 +2662,11 @@ def add_project_variable(self, variable_name, variable_value):
         """
         if not variable_name.startswith("$"):
             variable_name = f"${variable_name}"
-            if not self.variable_exists(variable_name):
-                return self.active_db.add_variable(variable_name, variable_value)
-            else:
-                self.logger.error(f"Variable {variable_name} already exists.")
+        if not self.variable_exists(variable_name):
+            return self.active_db.add_variable(variable_name, variable_value)
+        else:
+            self.logger.error(f"Variable {variable_name} already exists.")
+            return False
 
     def add_design_variable(self, variable_name, variable_value, is_parameter=False):
         """Add a variable to edb. The variable can be a design one or a project variable (using ``$`` prefix).
@@ -2708,6 +2709,7 @@ def add_design_variable(self, variable_name, variable_value, is_parameter=False)
             return self.active_cell.add_variable(variable_name, variable_value)
         else:
             self.logger.error(f"Variable {variable_name} already exists.")
+            return False
 
     def change_design_variable_value(self, variable_name, variable_value):
         """Change a variable value.
diff --git a/src/pyedb/grpc/edb_core/modeler.py b/src/pyedb/grpc/edb_core/modeler.py
index 7242438bea..2b64d2f2f8 100644
--- a/src/pyedb/grpc/edb_core/modeler.py
+++ b/src/pyedb/grpc/edb_core/modeler.py
@@ -1107,20 +1107,21 @@ def parametrize_trace_width(
             layers_name = [layers_name]
         for net_name in nets_name:
             for p in self.paths:
+                _parameter_name = f"{parameter_name}_{p.id}"
                 if not p.net.is_null:
                     if p.net.name == net_name:
                         if not layers_name:
                             if not variable_value:
                                 variable_value = p.width
                             self._pedb.active_cell.add_variable(
-                                name=parameter_name, value=variable_value, is_param=True
+                                name=_parameter_name, value=GrpcValue(variable_value), is_param=True
                             )
-                            p.width = parameter_name
+                            p.width = GrpcValue(_parameter_name, self._pedb.active_cell)
                         elif p.layer.name in layers_name:
                             if not variable_value:
                                 variable_value = p.width
                             self._pedb.add_design_variable(parameter_name, variable_value, True)
-                            p.width = GrpcValue(parameter_name)
+                            p.width = GrpcValue(_parameter_name, self._pedb.active_cell)
         return True
 
     def unite_polygons_on_layer(self, layer_name=None, delete_padstack_gemometries=False, net_names_list=[]):
diff --git a/tests/grpc/system/test_edb.py b/tests/grpc/system/test_edb.py
index af916ba3c4..03a8d35100 100644
--- a/tests/grpc/system/test_edb.py
+++ b/tests/grpc/system/test_edb.py
@@ -38,7 +38,6 @@
 class TestClass:
     @pytest.fixture(autouse=True)
     def init(self, local_scratch, target_path, target_path2, target_path4):
-        # self.edbapp = grpc_edb_app
         self.local_scratch = local_scratch
         self.target_path = target_path
         self.target_path2 = target_path2
@@ -194,22 +193,20 @@ def test_hfss_mesh_operations(self, edb_examples):
 
     def test_add_variables(self, edb_examples):
         """Add design and project variables."""
-        # TODO check status of buf #432 assigning parameter on
+        # Done
         edbapp = edb_examples.get_si_verse()
         edbapp.add_design_variable("my_variable", "1mm")
         assert "my_variable" in edbapp.active_cell.get_all_variable_names()
         assert edbapp.modeler.parametrize_trace_width("DDR4_DQ25")
         assert edbapp.modeler.parametrize_trace_width("DDR4_A2")
-        result, var_server = edbapp.add_design_variable("my_parameter", "2mm", True)
-        assert result
-        assert var_server.IsVariableParameter("my_parameter")
-        result, var_server = edbapp.add_design_variable("my_parameter", "2mm", True)
-        assert not result
-        result, var_server = edbapp.add_project_variable("$my_project_variable", "3mm")
-        assert result
-        assert var_server
-        result, var_server = edbapp.add_project_variable("$my_project_variable", "3mm")
-        assert not result
+        edbapp.add_design_variable("my_parameter", "2mm", True)
+        assert "my_parameter" in edbapp.active_cell.get_all_variable_names()
+        variable_value = edbapp.active_cell.get_variable_value("my_parameter").value
+        assert variable_value == 2e-3
+        assert not edbapp.add_design_variable("my_parameter", "2mm", True)
+        edbapp.add_project_variable("$my_project_variable", "3mm")
+        assert edbapp.db.get_variable_value("$my_project_variable") == 3e-3
+        assert not edbapp.add_project_variable("$my_project_variable", "3mm")
         edbapp.close()
 
     def test_save_edb_as(self, edb_examples):