except ldap.ALREADY_EXISTS as ex:

					sAMAccountName_attr_value = object['attributes'].get('sAMAccountName')[0]

					objectSid_attr_value = object['attributes'].get('objectSid')[0]

					objectSid = decode_sid(objectSid_attr_value)

					if not (sAMAccountName_attr_value and objectSid):

						raise	## unknown situation

					filter_s4 = '(&(sAMAccountName=%s)(objectSid=%s)(isDeleted=TRUE))' % (sAMAccountName_attr_value, objectSid)

					ud.debug(ud.LDAP, ud.WARN, "sync_from_ucs: Error during add, searching for conflicting deleted object in S4. Filter: %s" % filter_s4)

					result = self.lo_s4.lo.search_ext_s(self.lo_s4.base, ldap.SCOPE_SUBTREE, filter_s4, ['objectClass', 'objectCategory', 'isDeleted', 'isRecycled', 'lastKnownParent'], serverctrls=[self.ctrl_show_deleted, LDAPControl(LDB_CONTROL_DOMAIN_SCOPE_OID, criticality=0)])

					if not result or len(result)>1:	## the latter would indicate corruption

						ud.debug(ud.LDAP, ud.WARN,"sync_from_ucs: No conflicting object found.")

						raise	## unknown situation

					(deleted_object_dn, deleted_object) = result[0]

					ud.debug(ud.LDAP, ud.WARN, "sync_from_ucs: Reanimating deleted object in S4: %s" % deleted_object_dn)

					## Currently tombstone_reanimate.c and tests/python/tombstone_reanimation.py

					## which implement https://msdn.microsoft.com/en-us/library/cc223467.aspx (MS-ADTS 3.1.1.5.3.7)

					## are disabled in Samba. Workaround:

					idx = deleted_object_dn.find('\x0ADEL:')

					reanimate_modlist = [(ldap.MOD_DELETE, 'isDeleted', 'TRUE')]

					reanimate_modlist.append((ldap.MOD_DELETE, 'lastKnownParent', deleted_object['lastKnownParent'][0]))

					reanimate_modlist.append((ldap.MOD_DELETE, 'isRecycled', 'TRUE'))

					if not deleted_object.get('objectCategory'):

						top_most_structural_objectclass = deleted_object['objectClass'][-1]

						result = self.lo_s4.lo.search_ext_s("CN=Schema,CN=Configuration,%s" % self.lo_s4.base, ldap.SCOPE_SUBTREE, 'lDAPDisplayName=%s' % top_most_structural_objectclass, ['defaultObjectCategory'])

						reanimate_modlist.append((ldap.MOD_ADD, 'objectCategory', result[0][1]['defaultObjectCategory'][0]))

					self.lo_s4.lo.modify_ext_s(compatible_modstring(deleted_object_dn), compatible_modlist(reanimate_modlist), serverctrls=[self.ctrl_show_deleted,])

					self.lo_s4.lo.rename_s(compatible_modstring(deleted_object_dn), deleted_object_dn[:idx], newsuperior=deleted_object['lastKnownParent'], delold=1)

					## and retry

					return self.sync_from_ucs(property_type, object, pre_mapped_ucs_dn, old_dn, old_ucs_object, new_ucs_object)