diff --git a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
index f4f542edd3d09d4bd133709fe0e42ae4cc4d9ffe..7bb0dbf55934411c0ea5073d4696f8bdeb61d601 100644
--- a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
+++ b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
@@ -14,18 +14,18 @@
 # limitations under the License.
 #
 # MasterDataRegistrationTransaction Class
-import sys
-from ch.ethz.sis.openbis.generic.asapi.v3.dto.service import CustomASServiceExecutionOptions
-from ch.ethz.sis.openbis.generic.asapi.v3.dto.service.id import CustomASServiceCode
 from ch.ethz.sis.openbis.generic.server.asapi.v3 import ApplicationServerApi
 from ch.systemsx.cisd.openbis.generic.server import CommonServiceProvider
+from ch.ethz.sis.openbis.generic.asapi.v3.dto.service.id import CustomASServiceCode
+from ch.ethz.sis.openbis.generic.asapi.v3.dto.service import CustomASServiceExecutionOptions
 from ch.systemsx.cisd.openbis.generic.server.jython.api.v1.impl import MasterDataRegistrationHelper
+import sys
 
 helper = MasterDataRegistrationHelper(sys.path)
 api = CommonServiceProvider.getApplicationContext().getBean(ApplicationServerApi.INTERNAL_SERVICE_NAME)
 sessionToken = api.loginAsSystem()
 props = CustomASServiceExecutionOptions().withParameter('xls', helper.listXlsByteArrays())\
-    .withParameter('xls_name', 'ELN-LIMS').withParameter('update_mode', 'UPDATE_IF_EXISTS')\
+    .withParameter('xls_name', 'ELN-LIMS').withParameter('update_mode', 'IGNORE_EXISTING')\
     .withParameter('scripts', helper.getAllScripts())
 result = api.executeCustomASService(sessionToken, CustomASServiceCode("xls-import-api"), props);
 print("======================== master-data xls ingestion result ========================")