diff --git a/management/univention-directory-manager-modules/modules/univention/admin/handlers/__init__.py b/management/univention-directory-manager-modules/modules/univention/admin/handlers/__init__.py
index 0e2f308..bfc178e 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/handlers/__init__.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/handlers/__init__.py
@@ -1039,7 +1039,8 @@ def _call_checkLdap_on_all_property_syntaxes(self):
 			properties = self.descriptions
 		for pname, prop in properties.items():
 			if hasattr(prop.syntax, 'checkLdap'):
-				prop.syntax.checkLdap(self.lo, self.info.get(pname))
+				if not self.exists() or self.hasChanged(pname):
+					prop.syntax.checkLdap(self.lo, self.info.get(pname))
 
 	def __prevent_ad_property_change(self):
 		if not _prevent_to_change_ad_properties or not self._is_synced_object():