diff --git a/ucs-school-lib/python/models/base.py b/ucs-school-lib/python/models/base.py
index 082fb6009..901db6c0a 100644
--- a/ucs-school-lib/python/models/base.py
+++ b/ucs-school-lib/python/models/base.py
@@ -713,7 +713,7 @@ class UCSSchoolHelperAbstractClass(object):
 				except (noObject, IndexError):
 					self._udm_obj = None
 				else:
-					self._udm_obj.open()
+					self._udm_obj.open(False)
 			self._udm_obj_searched = True
 		return self._udm_obj
 
@@ -781,7 +781,7 @@ class UCSSchoolHelperAbstractClass(object):
 		logger.debug('Getting all %s of %s with filter %r', cls.__name__, school, complete_filter)
 		ret = []
 		for udm_obj in cls.lookup(lo, school, complete_filter, superordinate=superordinate):
-			udm_obj.open()
+			udm_obj.open(False)
 			try:
 				ret.append(cls.from_udm_obj(udm_obj, school, lo))
 			except NoObject:
@@ -835,7 +835,7 @@ class UCSSchoolHelperAbstractClass(object):
 				# while Group must be converted into ComputerRoom, etc. and User must be converted into Student, etc.
 				raise WrongModel(udm_obj.dn, klass, cls)
 			return klass.from_udm_obj(udm_obj, school, lo)
-		udm_obj.open()
+		udm_obj.open(False)
 		attrs = {'school': cls.get_school_from_dn(udm_obj.dn) or school}  # TODO: is this adjustment okay?
 		if cls.supports_schools():
 			attrs['schools'] = udm_obj['school']
@@ -919,7 +919,7 @@ class UCSSchoolHelperAbstractClass(object):
 		if len(objs) > 1:
 			raise MultipleObjectsError(objs)
 		obj = objs[0]
-		obj.open()
+		obj.open(False)
 		return obj
 
 	@classmethod