diff --git a/neuroml/nml/helper_methods.py b/neuroml/nml/helper_methods.py
index a7f0bd4..37b1a94 100644
--- a/neuroml/nml/helper_methods.py
+++ b/neuroml/nml/helper_methods.py
@@ -1,5 +1,5 @@
-import sys
 import re
+import sys
 
 
 #
@@ -1872,7 +1872,7 @@ def add_membrane_property(self, property_name, **kwargs):
 
         """
         self.setup_nml_cell(use_convention=False)
-        prop = self.biophysical_properties.membrane_properties.add(property_name, **kwargs)
+        prop = self.biophysical_properties.membrane_properties.add(property_name, validate=False, **kwargs)
         return prop
 
 
@@ -2544,9 +2544,7 @@ def get_morphology_root(self):
 
 inserts = {}
 
-inserts[
-    "Network"
-] = """
+inserts["Network"] = """
 
 
         netGroup = h5file.create_group(h5Group, 'network')
@@ -2578,9 +2576,7 @@ def get_morphology_root(self):
 
 """
 
-inserts[
-    "Population"
-] = """
+inserts["Population"] = """
 
         popGroup = h5file.create_group(h5Group, 'population_'+self.id)
         popGroup._f_setattr("id", self.id)
@@ -2622,9 +2618,7 @@ def __str__(self):
 
 """
 
-inserts[
-    "Projection"
-] = """
+inserts["Projection"] = """
 
         projGroup = h5file.create_group(h5Group, 'projection_'+self.id)
         projGroup._f_setattr("id", self.id)
@@ -2711,9 +2705,7 @@ def __str__(self):
 
 """
 
-inserts[
-    "ElectricalProjection"
-] = """
+inserts["ElectricalProjection"] = """
 
         projGroup = h5file.create_group(h5Group, 'projection_'+self.id)
         projGroup._f_setattr("id", self.id)
@@ -2786,9 +2778,7 @@ def __str__(self):
 """
 
 
-inserts[
-    "ContinuousProjection"
-] = """
+inserts["ContinuousProjection"] = """
 
         projGroup = h5file.create_group(h5Group, 'projection_'+self.id)
         projGroup._f_setattr("id", self.id)
@@ -2867,9 +2857,7 @@ def __str__(self):
 """
 
 
-inserts[
-    "InputList"
-] = """
+inserts["InputList"] = """
 
         ilGroup = h5file.create_group(h5Group, 'inputList_'+self.id)
         ilGroup._f_setattr("id", self.id)
diff --git a/neuroml/nml/nml.py b/neuroml/nml/nml.py
index b636bf3..cc3c518 100644
--- a/neuroml/nml/nml.py
+++ b/neuroml/nml/nml.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 #
-# Generated Wed May  8 18:20:27 2024 by generateDS.py version 2.43.3.
+# Generated Thu May 30 18:34:59 2024 by generateDS.py version 2.43.3.
 # Python 3.11.9 (main, Apr 17 2024, 00:00:00) [GCC 14.0.1 20240411 (Red Hat 14.0.1-0)]
 #
 # Command line options:
@@ -28,33 +28,24 @@
     ModulenotfoundExp_ = ModuleNotFoundError
 except NameError:
     ModulenotfoundExp_ = ImportError
-from six.moves import zip_longest
-import os
-import re as re_
 import base64
 import datetime as datetime_
 import decimal as decimal_
-from lxml import etree as etree_
-
+import inspect
 import math
-
+import os
+import re as re_
+import typing
 from math import pi, sqrt
-
 from operator import attrgetter
 
-import inspect
-
+import natsort
 import networkx as nx
-
 import numpy
-
-import natsort
-
-import typing
-
+from lxml import etree as etree_
+from six.moves import zip_longest
 
 import neuroml
-
 import neuroml.neuro_lex_ids
 
 Validate_simpletypes_ = True
@@ -49444,7 +49435,7 @@ def add_membrane_property(self, property_name, **kwargs):
         """
         self.setup_nml_cell(use_convention=False)
         prop = self.biophysical_properties.membrane_properties.add(
-            property_name, **kwargs
+            property_name, validate=False, **kwargs
         )
         return prop