diff --git a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTest.java b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTest.java
index 9cf63e3679a8c8a9297b365b41ab76cfc2e8d610..9c19f0fae51d6570432701984b71cecbd597421e 100644
--- a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTest.java
+++ b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTest.java
@@ -1366,7 +1366,7 @@ public class UpdateDataSetTest extends AbstractDataSetTest
         // Act
         DataSetUpdate update = new DataSetUpdate();
         update.setDataSetId(id);
-        update.getMetaData().add(Map.of());
+        update.getMetaData().set(Map.of());
         v3api.updateDataSets(sessionToken, Arrays.asList(update));
 
         // Verify
diff --git a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTypeTest.java b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTypeTest.java
index 72cc68609b9f6872c15db52feee2aeaf4fe0a3de..74baedf52f809ac311983540bb967bdc83311cb7 100644
--- a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTypeTest.java
+++ b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateDataSetTypeTest.java
@@ -214,7 +214,7 @@ public class UpdateDataSetTypeTest extends UpdateEntityTypeTest<DataSetTypeCreat
         // Act
         DataSetTypeUpdate update = new DataSetTypeUpdate();
         update.setTypeId(new EntityTypePermId("DATA_SET_META_DATA_TEST"));
-        update.getMetaData().add(Map.of());
+        update.getMetaData().set(Map.of());
         v3api.updateDataSetTypes(sessionToken, Arrays.asList(update));
 
         // Verify
diff --git a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTest.java b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTest.java
index c9ae2d6da118009e2f8542d9e93724f117aff25e..0d9f8c5aa9995d72dc788f6909a402f7e1d3d81d 100644
--- a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTest.java
+++ b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTest.java
@@ -1337,7 +1337,7 @@ public class UpdateExperimentTest extends AbstractExperimentTest
         // Act
         final ExperimentUpdate update = new ExperimentUpdate();
         update.setExperimentId(permId);
-        update.getMetaData().add(Map.of());
+        update.getMetaData().set(Map.of());
 
         v3api.updateExperiments(sessionToken, Arrays.asList(update));
 
diff --git a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTypeTest.java b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTypeTest.java
index d54f378cbc3445b7d590c99cf0bf3dfaf1fdfba0..0448813d1b0a6e704828480d786b856b44f2e235 100644
--- a/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTypeTest.java
+++ b/server-application-server/sourceTest/java/ch/ethz/sis/openbis/systemtest/asapi/v3/UpdateExperimentTypeTest.java
@@ -195,7 +195,7 @@ public class UpdateExperimentTypeTest extends UpdateEntityTypeTest<ExperimentTyp
         // Act
         ExperimentTypeUpdate update = new ExperimentTypeUpdate();
         update.setTypeId(new EntityTypePermId("EXPERIMENT_TYPE_META_DATA_TEST"));
-        update.getMetaData().add(Map.of());
+        update.getMetaData().set(Map.of());
         v3api.updateExperimentTypes(sessionToken, Arrays.asList(update));
 
         // Verify